Pickup Henne as QB?

[mmcquaid19]

First-time playing fantasy football and I have no clue what I'm doing.

My team:
QB: Josh Freeman
WR: Reggie Wayne
WR: Wes Welker
RB: LeSean McCoy
TE: Vernon Davis
WR/RB: Frank Gore
K: Matt Bryant
DEF: Detroit
Bench
QB: Kyle Orton
RB: Roy Helu
WR: Pierre Garcon
WR: Julio Jones
WR: Steve Smith
TE: Todd Heap

Wondering if I should drop a player and pickup Henne. Also thinking of dropping Helu and Garcon. Thoughts?