Ive some newbies questions.

I signed up with bigstockphoto cause Ive a bunch of old 1,5mp photos I want to upload, after reading some blogs I found here I see Shutterstock makes ppl most moneyz. So i guess I shoud start posting there any new photos from my 10mp camera.

I see you have portefolios on all those sites, is that the same pictures just sent to a bunch of different sites?
Is there other sites I should put my less then 2,5 mp photos on ?(I think Ive some great one since I love to travel alot and take photos but who knows).

If you only can upload 1 photo on 1 site how do you choose what pics you put where?

Thanks