Quote Originally Posted by Shlnsengumi View Post
Is it recommended that I sell my weapons
Just sell anything when you get an equal or better version of it, or anything that you find that isn't useful.

where can i find stuff to fill in my empty nods
Mostly it comes from stealing from every monster you see, but there are some abilities that use Power Spheres, Speed Spheres etc. However, in this game, you focus more on building up stats and abilities than creating killer weapons. (Which, incidentally, you'll find soon enough)