Hi Artsy Bunny,
As a sole proprietorship business in CA, yes you can do your own taxes using Turbo Tax online or the desktop version. You will be adding a form Schedule C, to your personal return form 1040. At Turbo Tax, we have Full Service Tax experts that can file your return for you.
To file your yearly tax return for your Sole Proprietorship, you need your total income and expenses attributable to your business. You do not need to file quarterly business taxes, but you may need to make quarterly estimated tax payments.
https://turbotax.intuit.com/tax-tips/small-business-taxes/estimated-taxes-how-to-determine-what-to-p...
Here is a link to Schedule C Sole Proprietorship and Estimated tax and withholding.
https://www.irs.gov/forms-pubs/about-schedule-c-form-1040
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