How Is A Beach Buggy Worth General Beginner Questions About Nitro RC Cars.?

General beginner questions about Nitro RC cars.? - how is a beach buggy worth

I am thinking of buying a Nitro RC. Or a pram or a truck, something very good off-road, but I have some questions.

1. About how much fuel and how long? Since the dollar amount of fuel do you think the average person could spend in 30 minutes, have the car?
2. For driving in the sand? How on the beach all day or go in there to get it disturbs the sand?
3. What is water? Can you drive through puddles without damaging them?
4. What mud? Can you then through swamps of mud and hoses from them?
5. What will be a powerful engine? I see 15 's, .18' s, 28 's between them. What engine size is usually not necessary to go 60 mph on a drunkGGY or truck.
6. What are the pros and cons of buggy 4x4 against a 4x4 truck?
7. I saw a little power (even for less than $ 100), who say they can reach speeds of nitro. Electricity is very good?

Thank you.