No audits or reviews. Only compilations, some tax work, and risk management/advisory. I'm a bit niche b/c 3/4 clients are non-profits, so they tend to be short on infrastructure, knowledge, and compliance.
Compilations: Receivables/payables, monthly reconciliations, internal and external reporting for budgets, grants, planning.
Tax: Compliance with deductible donations, sales tax, payroll (mostly review work b/c it's outsourced but I can do amendeds and correct ADP/Paychex/Primepay's work), research (annual health care deduction, income tax treatment of foreign nationals, etc).
Risk management: Internal controls documentation, year-end audit support; worker classification, insurance coverage for events and operations.
Consider what someone at your level makes as an annual salary and convert it to an hourly rate by dividing by 2,000 hours; then bump it up at what you think is a fair percentage (b/c now you're paying for SE, WC, liability insurance) and compare it to what your local bookkeepers are charging. If you're licensed, have insurance, and know when/how to do journal entries, then you definitely have to charge more per hour than just an hourly bookkeeper, b/c chances are you will invest a lot of initial time learning how things are set up, and then correcting a lot of previous work.
Keep in mind that there's a certain economy of scale for outsourcing payroll when it starts to become >2 employees. That economy of scale starts to drop off at some point in the hundreds or thousands for small to mini-mid-size companies.
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