Okay,
Well from what i hear this is just your first stage of a long long progression you are going to make.
You will just have to practise some aiming. Try to hit the target, and after that, you will be able to progress through the game fluidly.
Experience is the one thing you need right now.
but as far as using the suit:
Make sure you ambush them, lay down traps, and scan your surroundings using the suit. It will give you upportunities to engage in battle.
One thing i did in Supersoldier, was 'hit and run'. That means that you shoot a few targets, then get the hell out of there, come back and shoot a few targets again.
Good luck, and if you still got any questions, feel free to ask.
Happy Gaming,
Ceph Nightmare