I just liberated drassen and trained a fighting force in the airport while i waited for my supplies to arrive. It then occurred to me that i only have 4 days left before i have to pay my mercs for being around. I cant figure out how to make money from the mine in drassen. Does something happen soon, or did i mess up?

On the southern map, next to the mine entrance there is the mine foremans building...i think it has a red or yellow sign. Talk to him and he will tell you they will hand over the profits to you as long as you control Drassen. If loyalty dips into the red then you will stop getting the funds.
You will hit problems with the mines as the game continues but money shouldn't really be an issue unless you hire too many of the highest paid mercs.

You can certainly go through the game with stealth characters, although it can be more time consuming than tricky. You might wanna think about carrying some throwing knives for the sneaky insta-kills and those energy-sucking grenades. And Grizzly backing you up with a mortar in case things take a turn is sometimes pretty useful.

With the 1.13 mod (which your probably using anyway) you can leave the gaming running in realtime when you spot an enemy whilst stealthed which can help you set up your mercs in better positions rather than attacking straight away.

Thanks again. I will take your advice and get some daggers. Does it ever state though whats a good gun because some of them say that they are unrealiable or are reliable. What does that mean, they will hit more in accuracy?

Guns can get jammed. It happens more often if they're in poor condition. A jammed gun can sometimes get unjammed if you keep trying to fire it or you can unjam it by repairing it.

For close quarters a pair of good pistols on an ambidextrous merc can be positively lethal especially when you add sights and in 1.13 some AET ammo. I had a load of fun with a custom stealth merc with ambi. and a pair of tricked out 45 calibre USP's rampaging though the jungle at night.