Hi maswu,
Nest way to start is t\to Keep It Simple - as simple as possible.
Just one friend, one simple background and one light source (sun).
Then add reflector as Ortega mentioned, and learn how to look at light, and the way it shapes your subject.
Also look at the different times of the day, and how weather conditions change the quality of light.
You can also do this at home with window light, and a few fruits and vegetables. Don't laugh, but taking your time, use only one light source and a reflector ... look at different angles of light, and how to play with the reflector - can teach you more than 100 chio bu models and 10 assistants.
Once you realise how to 'see' light angle, and the way it affects, or 'sculpts' your subject, you will feel much more confident when shooting your friend.
Above all else, have fun, but learn something while you're having fun.