An aviation mnemonic you'll probably learn in flight training to remind you of what to do in a go-around:

Cram it.

Climb it.

Clean it.

Call it.

Cool it.

Cram it:
Push that throttle in all the way! Further if possible.

Climb it:
The idea here is that we want to go around and try it again. Hard to do if you hit that fence at the far end.

Clean it:
Most airplanes wont climb very well with the gear hanging out and the flaps full down. Pull those legs up if applicable and begin bringing the flaps up.

Call it:
Might be a good time to let tower know that you're going around.

Cool it:
It's supposed to be fun remember?