Don't know what to do after development?

I am generally ok with tactics and developing my pieces but after both sides have finished developing I am rather lost on what to do. Any advice on how to help with my problem?

You have to know the plan behind each opening. Learning the theory is vital.

Mindless development of your forces not knowing why and what for right from move 1 playing with no plan and clear aim is suicide your opponent if he or she is a good player will cut you to pieces if you play like that.

Every piece has a role to play and needs to work in close harmony with the others they attack together they defend their King together they need clear lines of communication with each other and you for them to achieve their objectives.

After developing your pieces, you then attack. The opening you play already dictates which attacks are best for that position.

http://www.chess.com/forum/view/general/initiative

Formulate a plan.  You're supposed to compose plans in critical positions, and the moment you're out of book falls into that category.  How is the pawn structure and center?  What imbalances are there?  What are the most meaningful imbalances (so you don't get distracted by the noise in the position, trying to exploit the open king in the Sveshnikov Sicilian for example is a futile effort that usually only helps black)? 

You make thoughts like, "Should I play Nxc6?  I don't want to hand him extra control over d5 and the semi-open b file looks useful for him so I'll scrap it"  Whereas a weaker player would think, "1.Nxc6,bxc6 because doubled pawns are weak"

Then you formulate candidate moves that are motivated by your plan.  Calculate far and wide, If you can't visualize this:

After this:

Then brush up on visualization.  Judgment and calculation go hand in hand.  If you won't defeat your candidate moves your opponent will.