If you choose your state of incorporation wisely, none of these would be a hassle.
You can do your accounting on your own if you wish so (Wave App
is free to use). Or you could use software to do the accounting for you. Or you could outsource it. This is up to you.
For single-member LLCs, you don’t need high-level accounting. You need just to show how much you’ve earned and how much you’ve spent on your tax return form (the 5472).
The IRS may choose your LLC randomly and audit it. It is not necessarily a bad thing, as long as you keep everything tidy.
If you make more than a few hundred bucks a month and you have many transactions (not one or two clients bringing all the money), outsourcing accounting will give you peace of mind and let you focus on the stuff you enjoy better.
Audits are not required in Wyoming and New Mexico, nor are annual meetings.
C-corps are usually larger organizations and may require more.
At least, you may need to hold an annual meeting. It can be held in any country and is just a formality and paperwork. You’ll need minutes of the meeting and, depending on the state, maybe some form to be filled.
Again, C-corp is a structure suited for larger teams and larger companies, hence the greater requirements for them.
Outsourced accounting is often a necessity (although not obligatory). Annual meetings are usually required. Audits requirements depend on the jurisdiction.