For basic stuff like what your asking, I would suggest to get an owners manual and shop manual on your phone or computer. oscarmeyer.com is a good one, there's a link to it somewhere on this site.
With the gas, just use normal unleaded gas, it's a 4 stroke so no need to mix in oil. For the oil, I personally use 10W-30, since it's the most common and readily available, but I think Honda recommends 10W-40. Doesn't really matter as long as your close. Good luck.
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3 Wheelers:
1983 Honda ATC 200E Big Red "The Barn Find"
1984 Honda 200x with 200s engine "Auto-X"
1981 185s junker SOLD
1983 Honda ATC 185s "the original" SOLD
1984 Honda ATC 200s "The FrankenTrike" SOLD
1984 Honda ATC 200s "ole reliable" SOLD
1986 Honda ATC 200x SOLD