game formats for beginners

A coach once advised me to play games at a time control of 15 minutes with a 10 second increment (or simple 20-30 minute games is around the same), and look at each of my losses to see what I can learn from them.

Anything faster than that doesn't give you time to think, and much longer is more thinking time than beginners really need.

If you're playing for over an hour, you're probably not going to remember anything about how the game started or progressed.  Keeping it shorter than that will keep it fun.  15 minutes each with a small increment is good.   Even then, you should write down all the moves (not necessarily every game, but often) and review your games later.

Too short and you spend all your time looking at the clock, not the board.  You won't learn anything other than "I was obviously in a hurry when I made that stupid move."

If you're a total beginner, you might enjoy playing a game where you start with some of the pieces already removed from the board.  This makes the games shorter and also lets you choose to focus on (or avoid) the pieces that you need to learn better (e.g., many beginners find knights unpredictable).  

I don't speak English