This is such a complicated topic that I'm sure I cannot do it total justice in this post, but it goes back to counting tricks before you even bid. You don't need a super long or strong side suit to take advantage of running out the trump. If you have an 8 card suit, the odds are pretty good that you can run out the trump and make certain non-trump cards good. It could be an entire side suit, or it could be 2 tens from 2 different 5 card side suits.
In order to be able to do this, you usually need to have some side suit aces that you will save (not play) in order to get back into the lead after you give up the lead forcing trump aces out. I call them "stoppers", because they allow you to stop the opposing team and put you back in the lead. There are other scenarios where you may be void in a suit or only have a singleton, and you can use trump as your stoppers, but then you need to have a longer trump suit. These types of hands are relatively easy to read and easy to predict the number of tricks you can take as the bidder, especially when playing against players who don't understand what you are trying to do. They will play right into your hands, and this happens more than you would think.
For example:
In this hand I would count 6 trump tricks, 2 diamond tricks and 0 or 1 spade tricks.
My lead would be
That would get an

out, and if my partner doesn't have the other

I will take the lead when I trump in on hearts or when I get in on diamonds, I will lead another

and force out the final

.
By the time I get the lead again, I will run out the trump (I always have a count of how many trump cards have been played and how many are remaining) until no one has trump in their hands but me. If I have any loser spades or diamonds, I will play them, to force out those aces. until when I take the lead, I can play my good

's. It is far more complicated than that, because there are things you have to look at during game play, but that is a deeper lesson for a different time.
If you are having difficulty seeing how that plays out, I will present an easier hand to see....the strong side suit:
Here you lead your

and get the trump ace out, then you run out trump, get out the

if they aren't already played and you run down your side suit after you lose your

cards so you can end up with the last trick.