Serving is to get an immediate offensive advantage in the rally.
Shall I say it once (or a hundred times) more?
Serving is to get an immediate offensive advantage in the rally. (x 100)
All manner of ways to do this.
Confusing or outright fooling opponent on the type or amount, or depth, angle, placement, direction, pace, break of the serve by creating an Arsenal of serves that can change all these things using the SAME arm slot and serve motion is paramount to achieving your subtle changes.
Another component is to understand your opponents and what they will do to the serve. They will not be fooled every ball and you need to be able to control their options and funnel their response to an area of YOUR choosing so you can open the attack DECISIVELY on YOUR terms.
Another obvious component of serve/attack is to have a wide array of attacking options that are very reliable high percentage that either win the point right there on 3rd ball, or give you the upper hand in the resultant rally. You gotta have understanding of opponent, his responses, your abilities, your will to pressure and win, and HOW to do it... all with high percentage, suddenness, and with aggression & control. Who says it doesn't pay to be violent aggressor in Table Tennis? Still, you gotta have a plan, a will, the training and experience.
Once you are better able to put these things together, you have the basic foundation to be flexible in your attack to win points in pursuit of TT GLORY !!!
OK, that is basically a condensed version of THEORY for serve and attack while on serve. How you put it together to win is a personal thing, yet there are many effective strategies and tactics that help you achieve world dominance in this area of your game.
All I can tell you is to practice with a plan and practice SOUND technique. You will need understanding of the mechanics, a huge will to succeed, and soft hands ? relaxed body & mind ready to suddenly turn Berserker in a flash bang.
We have in a ton of threads covered how to make each serve. The basic underspin short serve though is what sets up all your other serves for success. Soft wrist, loose body, fast bat speed, shorter stroke, better acceleration, and grazing the ball 6:00 BOTTOM of ball, and making first bounce halfway to net or just past is the start of it all.