#1
ive been saving up my money for about a month and im up to 350 dollars whats the best i can get for that much
#2
Standard things that will be asked are:

Genre:
Location:
If you're willing to stretch price:
And If you're willing to go used:
Amp:

I'd recomend something used, but if you could answer those questions first it would be helpful. And most people are going to say you should get a new amp 1st, depending on what you have.

And welcome to UG.
Where's Waldo?