There are quite a few topics on dirty talk, I think it’s a subject a lot if us (me included) feel awkward tackling so it would be worth doing a search of previous topics. This one, What’s your biggest ‘dirty talk’ turn on? is quite a good one for a read through though and also it’d be worth listening to the Podcast on How to Talk Dirty that Lovehoney did a while ago.
Hope they help! …I’m still no good at it though 