Maybe pick up some 40-45 weight oil for the shocks in case you don't like yours, but it isn't necessary right away. I believe the diffs are loaded with grease from the factory. I cleaned mine out and put in 50K oil for bashing. Again, not necessary.
The % on fuel usually pertains to nitro percentage. Although, it's noted on a few fuels as two percentages, i.e. 25%/10%, 25% nitro, 10% oil blend. That leaves 65% for methanol.
My LRP manual suggested 25% nitro to be the minimum, so I started running that in all my rigs. Although, I usually am forced to buy a gallon of 30% and 20%, then mix it 50/50 myself. I do like how the extra 5% makes it run though. Much better idle, a bit more power and a bit cooler. I just make sure to buy the same brand/type of fuel when I'm mixing.
The only fluids I'd consider "required" are fuel, after run oil, 3-in-1 oil and air filter oil.
I use a mix of 3-in-1 and WD40 to lube my normal bearings and my one way bearings in transmissions. But normal old 3-in-1 works well too.