I would be a little less pessimistic than Estragon here, as white still has some development advantage, and black's queenside may prove slightly exposed. It's true that if white doesn't threaten a quick d5 push or doesn't put pressure on the queenside, black will probably be better.
Specifically, after a Qd7 retreat, I would consider h3 trying to get the bishop pair, and after Qa5, Be3 followed by Qb3, or Bd2, or an immediate Qb3.
As for white's piece position, ideally, it would be Qb3 and Rfd1, Rac1, but probably we have to adapt to the circumstances
IQP typical plans are widely explained in the chess litterature, there's even a whole book dedicated to them !
Most openings books (at least those I encountered) fail miserably when it comes to explaining plans, not variations. That's what I can take with me when I play a game: I want to know what plan to follow in a certain position, where I should put my pieces, whether I should go for a queenside or kingside attack, or maybe I should defend.
For instance, in the following position, what should White do? Alternatively, what are Black's ideas? It's Black to move, obviously.