How do I enter business expense of depreciation of assets started by another tax professional?

I file a Schedule C with my tax return, and I have some business assets that are being depreciated as business expenses. I worked with a tax professional in previous years. I want to continue the depreciation, but how do I enter all of that information from scratch on TurboTax, and how do I account for the depreciation that has already occurrred, and then the depreciation that has yet to be deducted?

Thanks!