Commitment is the first thing that you need to have if you want to make a successful sliding tackle. This tackle needs a player to put his body on the line.
You should slide on side of your body. The side you chose depends on your comfort zone. Usually right footed players slide on the left side of their bodies and left footed players on their right.
It is important that you extend one of your legs and bent the other to get more balance. This way you will also get more leverage but also save your body from major injuries.
The timing is very important. If you do not make a clean contact with the ball, the referee is more likely to call a foul and you might get a booking. Depending on the situation and the extent of the foul will determine which card you get. If the tackle is a nasty one then be prepared to spend the remaining time of the match on the bench.
What you do with the ball once you have made the sliding tackle is what you will have to keep in your mind. If you think that the best option is to just remove the ball from the opponent’s possession, do so. If the coast is clear and the ball can be passed to your own teammate then you should pass the ball to your teammate. Otherwise, clear it to safety.