Your training will depend on what you want to do with your horse (competition, jumping, dressage, or just pleasure).
Usually, the best way to train your horse is 4 to 5 times a week, don't hesitate to change what you do (one day lunging, then dressage, then jumping, walk, groundwork).
One day of rest is necessary.
The more you will variate your training, the more your horse will be happy to work with you and he will improve faster.
Hope I could help you :)