Help with my team.

Who or what position should i look for?

c    AJ Pier
1b  Ad. Gonz.
2b  M. Young
ss   Espinoza
3b  M Cabrera
of   Pagan
of  Cespedes
of   J Jay
u   P. Sandoval
p  Nationals

Bench

Dee Gordon
R. Howard
Jackie Bradley
Markakis
Tejada
Angels Pitching

Think I may have a little ammo to made a decent trade?

Play Bradley, sit Pagan

Hard to say not knowing how many teams or what type of scoring you use but probably need to upgrade at 2B, SS, and OF.  If Sandoval or Angels pitching gets hot would look at trading them to try and upgrade elsewhere.  Jay, Gordon, and Tejada probably not worth owning, Bradley probably not either when Ortiz comes back.

If this is a 10 or 12 team league I wouldn't sweat your starters too much. It seems like everyone is pretty thin at SS/2B anyway.

I would look to solidify your bench. I would also jump ship on Angels pitching. I know it's a bad time now with their recent perfance but I would gladly take the A's over them right now. You can dump Bradley Jr as well. Roll the dice with some high upside risks on your bench.