I’m a first time rotary owner and I heard about premix but I don’t know how much what kind or anything really

 

if you have no metering pump, you should do about 1oz a gallon (sorry about the imperial units)
if you have a metering pump, maybe 1oz for 4 gallons, or less.

 

For me personally, this is the premix I use. Gauging by how much gas my FD burns, I find it easiest to just buy it in bulk.

Idemitsu Full Synthetic Rotary Engine Premix (12 qt – Case) – IR Performance

Also in the future, take note of what sections you're making post in relation to you topic. Judging by your user name, this post should've went in the 2nd Generation General Discussion section.

2nd Generation Specific (1986-1992) - RX7Club.com - Mazda RX7 Forum

 

My fault I don’t know how to use these forums

 

Hey man, no worries. I figured that was the case and thought I'd point you in the right direction. Everyone on this forum is here to help you, and there is a wealth of information already out there so if you click on that link you can start reading all of the post that came before you (note: There is A LOT. This forum was started in 2002 so anything you could possibly think of or any problem that you could possibly have has already been discussed...I promise) and if you have any questions, ask away and everyone will be happy to help.

If I haven't already said so, welcome to the forums!