ok so when ur disguised and u go to capture a command post do i lose disguise once i capture the post or when i start?
also does the side u choose at the start affect wat side u play in online because i always play security and never resistance

i think you lose disguise. also you can play both sides with the same guy, when youre in appearance screen use the button top right to pick out clothing.

so u lose disguise when u start or finish? and yea i no my too guys but it only ever shows the security guy on the main page and im always security in freeplay

You lose your disguise when you START capturing the command post.

When playing Freeplay, you will start as the faction which your character was created as. When you get to the screen where it counts down from 10 seconds until the match starts, hit start (Xbox 360) and select Change Team to pick Resistance.
Make sure you have Force Balance checked OFF in the Custom Settings for Freeplay for this to work.

You lose disguise whenever you have to whip out your little iPhone thing to hack/comms hack/etc

And the side you pick in the begginning (save the ark/escape the ark) is what the game recognizes as your preffered side when joining freeplay. Unless the team you prefer is full or you change your team manually in game, you will be whatever side you chose in the beggining.