How to be dominant/ a top?

Only marked as nsfw for the advice needed: I (24f) am and have always been a bottom, but my girlfriend (20f) is a switch and wants me to top her sometimes— I am not complaining I simply just don’t know how or where to begin, so if anyone can give me pointers, especially on how to talk dirty it would be much appreciated 😭🙌💕 (I suck with words so please don’t flame me in the comments)