Hello from WI - LP Reguator questions

Hello,
I’m just starting out, built a quick fire brick forge. Inside dim. H=4.5", W=6.5" & L=9", with one home made burner based on research. I have a 20# LP tank, now I’m not sure what regulator I should purchase.
Consider: this is a temporary forge for now, once I get going I would like to build something like the LP tank forge. I would like to progress into Damascus and forge welding, possibly a dual burner. This all said, I would like to buy a LP regulator that fits my set-up now and can me used as I progress. Thanx