Wall-E wrote:
Absolutely! Since all the speedlites will be able to 'see' the pop-up flash, there is no need for radio triggers for your 'small studio'.
It's when you venture out of the studio, that radio triggers will be necessary.
Learn to use what you have first, and then, when you've outgrown their abilities, consider purchasing new stuff.
And if you ARE going to do portraits, make sure you have enough room for the subjects to be 4-6 feet in front of the backdrop.
Generally this is true, but they can sometimes have issues seeing the flash once you stick them inside softboxes or if you put them off axis in any way. Kind of hard to get creative if you are limited to line of site.