The way you use your serve, depends on your opponent’s skills (or lack of).
For example… you might play against someone who has a clear weak side - it makes sense to serve in that direction; or someone who is slow to move and cover the court, etc.
But overall, I would strongly advise you to…
Learn or improve your wide serves.
When serving from the deuce side you should have a good slice serve (if you are right-handed); when serving from the ad side you should be consistent with your kick serve close to the singles line.
With these two types of serves, you can move your opponent off the court and control the point from the start.
Watch the following video for more details: