How to use FAAB in Dynasty

My first year playing dynasty. I play in a league that has $1000 for FAAB. During season I have some idea of what percentage of my FAAB should be spent at which positions and so forth but now while still in off-season not sure how to use FAAB. Akers went down today, X Jones is on waiver wire, what’s an average percentage of FAAB should be spent on players now. I understand it depends on the player but just looking for a ballpark. I already put in a bid so not asking what I should bid here just a general rule of thumb. Thanks!!