Re: I'm coming to Moscow and I'm scared to shit
There's an Italian restaurant next to red square where I got chicken penne and a coffee for about 20 bucks. Where I'm from in Canada, that's pretty reasonable. Like anywhere else I've been in Moscow, you can spend a fortune, but don't have to. There are affordable places to eat in the middle, don't worry. MyMy (pronounced "moo-moo") cafe is an okay place to go, and you can find them all over the place. I mean, it's not high class cuisine or whatever, but I don't gather you're looking for fine dining.
Real taxis are expensive, the unofficial ones can be cheap... or they can rip you off. I don't really recommend getting into unmarked vehicles unless you're with somebody that speaks Russian.
Clothes cost more here, but they have affordable shops like H&M and Uniqlo. I shop all the time, and my pay check isn't exactly huge. Shoes can be expensive, though.
The people are sometimes awful, other times awesome. Just like anywhere.
As for how many speak English... not many. If you're going to using the metro, you should know that all of the signs are in Russian. I guess that won't be a problem, since you're studying it.