How to find a reviewer/editor for my paper?
Your best bet is offering a graduate student a lot of money.  In most cases this is going to be an unpleasant job.  In most cases, the paper will be some combination of incorrect, incoherent, and uninteresting, but the author will usually be very resistant to hearing that.  (I don’t know you, hopefully this doesn’t describe you or your paper, but whoever you hire also isn’t going to know you or your paper.)  So you’re going to have to offer a lot of money to compensate and offer it to someone who doesn’t have a large salary.  Something like $100-$150/hour with the first two hours paid up front would probably be enough for a graduate student to overlook that it’s likely to be an unpleasant job.