single Family home is under LLC. Signed leasing contract with LLC as landlord. What are my personal liabilities if LLC is sued?

Generally, one of the advantages of having rental property in a Limited Liability Company is that any liabilities that might accrue to the owner of the property are the responsibility of the LLC only, and not of any members of the LLC. This can create some protection for your personal assets, provided that the liability doesn't accrue as a result of your own actions, such as if you left a door unlocked and some of the tenant's property was damaged or lost as a result.

You should also be sure to maintain the appropriate separation between the LLC and your personal affairs. This includes, but is not limited to, maintaining a separate bank account for the LLC's income and expenses and signing documents as LLC manager. If you don't have an operating agreement for the LLC, that is also advisable to clearly document the LLC's internal structure and operations.

If you buy property in your name and then lease in the LLC name you're likely to create confusion on the part of liability that would be to your detriment. If someone sues the owner of the property, that's still you regardless of whether the LLC is misidentified as Landlord in the lease. If the LLC is property manager then you bring the LLC into the mix for potential liability as well.