Neat!!

I would say it's out of focus because you are a bit too close. Step back a little

Don't try to use the smaller filters on the larger size lens or you will get some serious vignetting. always get filters to fit largest screw size lens and get stepping rigns to make them fit the smaller ones

Me again - you caould always set the camera focus point to be a single point if you really want to use autofocus. That way you can place the point where you want to focus. The depth of focus in macro is s0metimes down to a millimetre or so. If you go manual focus you can change the focal point by moving the camera in and out in very small amounts

Hi, If the subject is closer to the camera than the minimum focussing distance the shutter will not fire - step back a bit.
To get a closer focus there are a range of things you can do. First (and cheapest) is to invest in a +1 and a +2 dioptre filter set. These can be used singly or together to decrease your minimum focus distance. Shouldn't set you back more than $20 or so. Make sure you get the size to fit the filter thread on your lens. Just screw them to the front and see the difference.
Other more (much) expensive ways are to buy a macro lense or automatic extension tubes which fit between the lens and the camera.
Use a tripod - it is well nigh impossible to handhold the camera steady for macro shots.
Get off the green setting - you have no control over the shutter speed or aperture with that - program lets you change them whilst automatically setting the exposure. But I would reccommend using either shutter priority or fill manual exposure.
Also use manual focus - that way you focus on what you want, not what the camera thinks you want. There is a very shallow depth of focus in macro and you want to be able to place the focus point where you want it.
Most of these points have been covered above but take control of the focussing and exposure.
Good luck - would love to see how you get on!!

I am in Wellington, NZ. Clear here.