Use standard regular pump gasoline from your local service station for these RC engines (up to 10% ethanol). Do not blend different fuels with gasoline. Camper fuel is another alternative used; I personally have no experience with this product, from what I hear its greatest advantage is that it does not varnish over time like regular gasoline & has no odour.
I usually mix a large batch of 2 stroke & add Sta-bil which is a fuel stabilizer which does not allow the fuel to varnish in storage & has no adverse effects with performance.
Select a quality oil that is formulated close to the engines design & intended use. There is now a trend to use Outboard 2 stroke oil in the Zenoah Engines. After consulting with an oil rep, I personally would not. Outboards are water cooled so run at a cooler temperature whilst lawn care tools are air cooled & particularly chainsaws can run very hot. One is formulated for water cooled 2 stroke engines while the other is formulated for an air cooled 2 stroke operating at higher temperature.
There is a growing trend to really run high (lean) synthetic oil to fuel ratios as much as 60:1. This practice greatly increases the possibility of engine damage due to changes in atmoshperic conditions. A ratio of 25:1 is an engine fail safe even when using synthetic oil. I have played around with different ratios & yes you can get a nice clean looking heli at the end of the day & blowing very little smoke in the air but you can also empty your wallet quite quickly when you get that tune wrong with such a small margine of error.
If this is your first gasser heli use an oil ratio of 25:1, once you become comfortable with needle tweaking never go above a 30:1 ratio even if the oil manufacture specifies 50:1.