Queens Gambit Accepted

Hi, I am sorry but as a novice I am unsure as to how to proceed from a relatively simple variation of the queens gambit accepted. After d4, d5, c4, dxc4, e3, b5, a4, ba6, what is the correct progression such that I will be able to regain the lost material please? I don't really know what to do against this move and have made more than a few errors trying to cope with it. T

Thank you, any advice is greatly appreciated!

After 1. d4 d5 2. c4 dxc4 3. e3 b5 4. a4 Ba6, try b3 at some point, if not immediately. After cxb3, capture with axb4 (there is a double attack on the black b5 pawn after black plays cxb3) and capture the b-pawn later with the queen. 

Sometimes, the mistakes that accompany black trying to hold on too hard to the pawn result in the loss of a piece for that pawn. There are sometimes immediate tactics relating to moving the knight to e5 and the queen at f3, which either targets the a8 rook or the f7 pawn, which is possible because of both too much time spent by black defending the c4 pawn, or because black playing b5 exposes black's a8 rook.

Thank you very much, I like the look of that variation. Have a spectacular day!

i would take immediately on b5 and then nc3, immediately attacking the bishop.  as a result you're immediately getting great development and you'll eventually get the pawn back with a much better position (even if white never got the pawn back white would still be better)

Thanks, I'll try that, it seems like a good idea, then the only piece he could use to protect the bishop would be his queen, assuming his A and C pawns don't count because of obvious pins