GTA V

try these mission, potshot and coveted

 

You could always try to find some videos online. Don't know any direct routes due to only playing offline.

Spoiler

http://www.youtube.com/watch?v=BKRZInCdCa0

Note: Not even sure if that video is reliable. I just found something quick online.
Edit: That video is indeed outdated. Just look at is as an example. I'm sorry if this is of no help at all. (Which it isn't I guess)

 

There is a mission but u must be level 75 to get the mission or your friend host it for ya

The mission called rooftop rumble also it get u 25k money and 3k rp

 

If you want I'll take you through high level missions. Gamertag is iii wallsch iii