I would like to know as well. So far I think grinding the mission called violent duct is the fastest way for cash and levels.

I'm at level 40 because of this mission. It's by far the easiest, and q ...

What level does this mission unlock, or when does it appear?

it's unlocked at level 30/40 i think i will check soon and make sure and you get it from ron/trevor,

it's easy i can get 4 people in ...

What's worked best for me is, sniping the guys near the first jet and the ones that come in the truck, getting in the jeep, drive around throwing explosives at the jets and blowing them up and finally ...

You have to be lvl 27, ron calls you and yes you get 25k for completion. Also, it is nowhere near as easy as the 9k mission. Unless you have a good team, you are better off with the 9k

Keep calling gerald for missions until it pops up. Sometimes it takes a few tries.

After trying it once, I'm getting, "We dont need any vehicles right now"

Has that been an issue for you yet?

I did what you said, and it just put me outside of the pay n spray after I exited the marketplace.

Get a decent car, go to Pay and Spray and sell it and when you click sell and you see the money go up on the top right press start then press LB to go to online store, click A to go into store and whe ...

yeah i will but that didnt work so i dont know what to do?
He will call you randomly.

Go to trevor on the map. I did this, and ron called a few minutes later. That might be the problem..