Colloquial version: Wanna - Want to Gonna - Going to

As J Rios says, 'wanna' is equivalent to 'want to', and 'gonna' is equivalent to 'going to'. But please remember - these are not words. They are representations of the sounds we make when we are speaking quickly. We say them, but you should NOT write them. 'Can't' and 'Don't' and 'He's', for example, are acceptable spelling conventions representing informal language. 'Wanna' and 'gonna' are not. If you write them in an English exam you will lose marks. If you use them in a work context you won't stay in that job for very long. They make the writer look lazy and childish. It's fine to make these sounds when you're speaking, but please - DON'T use them in your writing.

and.... we may also add to these "gotta" = got to (must)

...and we also have "shoulda", "woulda", "coulda" representing should have, would have, and could have. But only ever spoken.