I run something like 80:1 fuel to oil. What I actually run is 2 oz per gallon, this is handy as I use a 2 gallon can, and a 4 oz nalgene bottle to measure. I run yamalube 2-s by choice, but any of the 2 stroke oils will work.
Some run race gas, some don't. I have run 91 octane through mine for 5 years, with no issues. Ours does have Ethanol, doesn't seem to make much difference.
Welcome to Trials!
ATGATT: When you fall off your motorcycle, you will be wearing what you were when you got on your motorcycle. Dress accordingly.