The personal rental will be reported on a Schedule E. Here's how to report it using TurboTax. It sounds like the LLC is possibly flipping houses. If this is the case, that will get reported on a Schedule C if it is a single member LLC and you didn't make an election to be taxed as a corporation.
The start-up costs can be deducted when the business begins to operate. If the costs are less than $50,000, you can deduct up to $5,000 and amortize the excess.
Here is a great resource for starting your business:
https://turbotax.intuit.com/tax-tips/self-employment-taxes/beginners-tax-guide-for-the-self-employed...
Hope this helps!
Cindy
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