ARM mortgage financing then cash-out refi?

[Ray Jansma]

I want to get into the BRRR strategy. What's the best way to finance your original mortgage on a a property? With an ARM rate if I plan on cash out refinancing anyways within a year? That way I can save on the interest rate? Or are there rules with ARMs that you can't do that and I would have to do a conventional loan during the original purchase? I'm not well versed in ARMs. Someone please offer some advise! Thanks!