The Safe Harbor for Small Taxpayers covers the building and the repair and maintenance for the building. That starts when it is "placed in service". However, in most cases the De Minimis Election will cover everything you need.
No, TurboTax does not figure out the Fair Market Value. Thrift stores, eBay, Craigslist, garage sales, etc. would be the best way. Intuit does have the program "Its Deductible", which is designed for charitable contributions, which is basically the Fair Market Value. However, that program can't really factor in the brand, quality, etc. of your items very well. It could be used as a tool to assist you (but personally, I find it annoying and incomplete, so I personally wouldn't use it).
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You also may consider a tax professional for the first year, to assist you with various questions and to give any recommendations based on your specific circumstances.
