how do you make money ? can't find a job
Purchase a map at the mall (first store IIRC). That will unlock the bank and the gay bar, and a few other places.
The banks loans you $20k, and you repay it back anytime with $2k interest. Aside from the bank loan, the fastest way to make money is through prostitution. (Oh, when I repaid the loan, the game didn't actually deduct the amount, so there's little reason to return the money and AFAIK no consequences for never doing so.)
The easiest way to make money at the beginning is waiting behind the toilets at the park and servicing clients - $40 each client and the game version I have currently ignores energy level with this option so you can spam that until the park closes.
Marcus can also find clients at the gay bar to make money - it's not as lucrative as the park though. After whoring Marcus out 5x (the park and/or gay bar), you can unlock the construction site after running into Mick (?) at the gay bar when picking up clients there. Once you've unlocked the construction site, you can spend the day there and make over $2k. It's grindy, but it's the fastest way to make money aside from the bank loan.
After a week (5 days?) in game you'll get a job at the father's firm. You get paid weekly, I think, some $80. It's really more for the office sex, and the sugar daddy ending I think. If you really want to make money Marcus will have to sell himself.
You can also try stealing at the mall, but you run the risk of jail time (not necessarily a bad thing) and the money I've gotten through stealing has always been a mere $20.
You can make meager amounts of money with the webcam (at least until you corrupt the brother). The laptop unlocks temp jobs (essentially gigs). Some of those are unlocked by corruption level.
Exploring the city at night can sometimes find Marcus a client - but being able to accept the proposition is unlocked by... corruption I assume. You can also be mugged at night (or raped depending on your settings). So it's risky until you purchase a gun.
Lastly, the 'stash' at High Tai lets you pimp Marcus out as well as hire other guys to work for you. That takes some investment ($3k just to get the key) to get up and running through.