Just because you don't have a "day job" doesn't mean that you don't have to pay for your taxes. If you need free help with your taxes and estimations on how much you owe per quarter...use Outright.com <---- no affiliation. Outright imports all of your transactions everyday from Paypal (and other services) and then you categorize them as a business expense or personal expense (and incomes). I've been using them for a while. It just helps me know how much I'll have to pony up to the IRS every quarter. It certainly won't replace an accountant, but it does help.
Here's the link again: Accounting Software | Online Small Business Bookkeeping Services - Outright