Well what do you mean exactly? Like legit sucking dick for money? If so, I'm sure it wouldn't be too difficult to figure it out. Find the type of dick bodied individual that's hard up enough to pay for that kind of service, and then you know.. provide the service (after first receiving the money, don't get suckered no pun intended).
How to find said individuals? Fuck if I know. Since the abolishing of Craigslist casual encounters, all us ho's been strugglin. I guess if you don't have too high of standards.. you could always lot lizard that shit. Truckers be payin steady to get sucked off. I'm sure your town has one of those streets too. You know the type of street. But be safe yo, use some form of barrier.
Also you could exploit the Craigslist community section. Missed connections or general are both fairly hit up with sex work adds. They get flagged often though so you'd be spending more time reposting than you would be workin the dicks.
If you want to make that shit work for you, you'd want to create numerous Craigslist accounts. Post your add and then visit your add from all your accounts. I believe if things still operate the same, posts won't get shut down if the vast majority of visitors to said post don't flag it.
If you leave it to the community, the majority of the viewers will flag it and it'll come down fast. So you have to counter their flags with many more views from Craigslist accounts that didn't flag it. Good luck!