Greetings.
I have been through a similar journey to yourself in the last couple of years. Also, you will get a wide range of advice here and elsewhere, and some is much better informed than others. At the end of the day, you can only arm yourself with information and make the decision that suits you the best.
Of the comments made so far I agree with Gessman's detailed posts. You have asked many questions covering a lot of issues which is of course complex.
1) Choice of camera brand and body model
On camera models and brands you are actually in a pretty good place. You have some excellent old film equipment and some lenses, although I have not seen that you gave us a list. If you have the higher end old FL / FDn (bayonet type, not breach-lock typically) it may be worth adapting them to a new digital slr. More on this later.
As far as brand is concerned it really comes down to whether you have a preference for any personal reason. If not, now is a really good time to find what appeals to you most by doing research and most importantly by getting your hands on lots of different brands and models. Both Canon and Nikon would be excellent choices, but so are several of the other premium brands.
Choosing your future brand is really important, since it will guide most of your future investment in lenses and other accessories.
Next the choice between APS-C (crop frame) and FF (full-frame) will affect that future investment. At least with Canon, the APS-C lenses (EF-S) do not work with the full-frame bodies, but the full-frame lenses (EF) work with both.
Although this is an overly simplistic explanation, there is a rule of thumb that full-frame EF lenses behave like lenses with 1.6x the focal length on APS-C camera bodies. This is really an angle of view issue, but it is a big consideration with wide-angle lenses. So if you have an ultra-wide FDn 20mm lens, it would behave like a 32mm lens on say a Canon T5i, which is not quite as radical. You have stated that you have a limited budget / income, and full-frame equipment will cost a lot more than a good APS-C based system, while the quality of APS-C can still be very high.
In terms of brand choice I started with Canon (AE-1, then T90) and am now building up a system based on a T3i. I will upgrade the body eventually, but am buying lenses etc. with that in mind. I expect to stay with APS-C for the foreseeable future. My primary reason for staying with Canon was the consistency of user interface between the AE-1/T90 and the T3i, so the learning curve was comfortable for me.
My wife has an old Nikon FM2 which she loved. I gave her a used T2i and a couple of lenses for Christmas and she is delighted with it. She can use me for advice on all the complexity offered by modern DSLR's and also have access to my range of other lenses etc., by sticking to a common brand.
If you are wanting to keep your costs low on a camera body, in the Canon range a decent used T2i, used/new T3i, or a T5i would all serve you well for still photography. For video, the T5i, T4i, T3i and T2i are all capable, but the newer models have increasingly more sophisticated video functionality. You could go further upscale with Canon bodies, but for myself I am totally content with the functionality and build quality of the T3i for now. I use the battery grip, which in my opinion adds nicely to the heft and balance of the system.
Whether you go with Canon, Nikon, Sony or whatever, there are excellent options available, and you may still be able to use your old FD lenses.
2) FD lenses
You will find lots of commentary on this topic and much of it is based on ill-informed partial knowledge, or just personal opinion about the pros and cons of old manual focus glass. There is a small amount of really well informed knowledge out there if you dig for it. Gessman knows what he is talking about here. I also use adapted FD lenses on my T3i. Since I grew up with a manual system I am OK with using them on my digital system. It's pretty similar to using them on the AE-1 or T90, although I do miss the split screen view finder. However it is very important to bear in mind two important considerations:
i) Adapted FD manual lenses are not so much a replacement for auto-focus lenses as an ability to add the benefits of creative effects that certain lenses can deliver.
ii) You have to like manual focus lenses and be comfortable using them.
If you read the following you will find some useful information to help you evaluate the situation:
http://www.uglyhedgehog.com/t-208230-1.htmlhttp://www.uglyhedgehog.com/t-184237-1.htmlhttp://www.uglyhedgehog.com/t-184606-1.htmliii) Printers
As with the advice of others, it is important to understand that printers are a vehicle for selling ink, and are frequently sold at prices close to cost or even lower. Many people recommend sticking with the pricy brand inks. Others manage ok with cheaper off-brand inks, but there are risks and trade-offs.
If you do decide to buy a printer there are again brand issues to be navigated. Epson is rated highly, I stuck with Canon. I had an old Canon Pixma IP4000 (letter size and below) that did a great job and lasted for close to 10 years before the print head died. I replaced it with a Canon Pixma Pro 9000 mark II which does an excellent job, up to 13" x 19", which I found brand new on ebay for $175. This had been part of a discount bundle where somebody got a great price on a camera, and sold off the printer on ebay. I think it is excellent, but the inks are not inexpensive, so I would think carefully given your comments about your income status.
The very best of luck, and I hope that my experience will be helpful as you make your decisions, whatever direction you choose to go in, or brand that you decide to settle on.