AD champs are a different playstyle than AP champs. However, depending on which champ you wish to use their playstyle will change, and different factors in each match will effect this as well. It would be too hard to go into much detail on this to really give you a good answer, I recommend looking up top rated guides for the champion you wish to try and reading through it completely. Most good guides will have a section going into playstyle and even how different champs and factors should affect this playstyle. Read some of these and try to incorporate what you read into your game. Really, it comes down to practice and strategy.
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And yes, your mother loves me.
Check out my Katarina guide!
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As a ranged AD champion, you should have some of the highest farm in the game. It's important to be able to last-hit, since AD carries generally have very expensive builds. For team fights, you'll just have to practice targeting weak enemies without exposing yourself, as you don't have the luxury to just nuke and back off. Most good champion guides have a laning phase and team fights section, so you might want to go there for advice.

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