Understanding BRRRR strategy

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Hey BP community, 

I'm trying to get a handle on the BRRRR strategy and although I think I've got it I have 2 quick questions:

1.) For the initial loan to obtain a property, does it make sense to go with a shorter term 15-year fixed and then refi to a 30-year fixed after 6-12 months?

2.) What are your thoughts on buying a property that currently has tenants? Good for the process or does that just get in the way of the rehab/refi part of the strategy?

Thanks!