Your best bet is checking top rogues on ladder and contact them.
I'm no glad, but some tips that I can give you:
Pool your energy, don't waste it with mindless spam. It sucks to not be able to do a disarm or kick in some critical moments.
Use shiv to kite (if needed), no need to tryhard dispelling with it.
Try to eat hunter traps (eg. if you see your priest is scattered run to him and try to get yourself trapped), as he can dispel it.
Be sure your priest is dispelling your kill target, he should also assist you with kills if possible.
Gouge is great, abuse it. Re-saps (and re-stealths in general) are important.
Get an addon like combatindicator if you don't have one already.
Idk there is a lot of stuff that you can do in order to improve.
Here's a link of marm playing rog/disc (most games vs disc/hunt which i understand you're having problems against):
I recommend watching other vids too, you can learn a lot from them.
Recording your games can also help as you can see exactly what you do wrong/what you could've done better.