What kind of controls are there?

Use the tutorial in game to get a better sense of the controls. However you can choose which hand you are more comfortable with. Look at the guide below for the right handed controls:

Main Weapon

The main weapon is on your chest and can be grabbed with the right-hand grab button. Release the button and the weapon will return to your chest. Hold the barrel with the left-hand grab button. Note that some weapons require two hands due to recoil. Use the right-hand trigger button to shoot. On your left waist you can use the left trigger button to take out a magazine, bring it close to the weapon to reload automatically.

Note that reloading before an empty magazine will be faster.

Sniper Rifle

On your right-side back you can use the grab button to take out the sniper rifle. When holding the sniper with two hands, press and hold left trigger to enter scope mode, only pull halfway to hold your breath.

Grenades

On your left forearm are grenades, use the right grab button to take one. Use the left trigger button to remove the safety pin and throw the grenade. You can also catch enemy grenades and throw them back before they explode. 

Note that you should make sure to tighten any supported wrist straps so you don't throw the controller.

Stimpack

On your right forearm is a stimpack. Use the left grab button to take one out and press against  your body to recover HP. 

Note that stimpacks and grenades replenish after some time. Note that stimpacks used on a friend provide a bonus stimpack to you.