All men usually decide what works for them without instruction.
I finish my pee (often expecting a double wee. (In other words, when you have first finished it is very likely that you may need to go quite a lot again after a few minutes; this is common for both sexes and according to a TV documentary about it, quite normal.)
I then lightly pinch the shaft of the penis and strain the tube of the urethra by running the fingers gently along to the bell end, perhaps 2 or three times using a bit of a squeeze. This clears the penis of urine and lets it dribble out the end. Once done, a snappy shake a couple of times should clear the tip of any drips. If this is not done, expect a dot of shame once you have dressed, (Stephen Fry's expression), damp pants and the whiff of wee.
This should not cause drips on the walls or floor, unless done by a sloppy idiot.
However, there is a issue if using a toilet if you do not stay over the bowl when urinating as the flow can often dribble backwards when pissing and this can often cause quite an unexpected puddle. This is rather like having a teapot with a badly designed spout.
If this occurs, it beholds the unskilled fool on he end of the hose to immediately check and dab the floor with whatever comes to hand, usually rather a lot of loo paper.
I am astonished that you have not watched your man having a wee. You or he must be very shy. Ask to look, it is a very simple human curiosity for heavens sake. I have watched many ladies doing that and most really do not seem to mind at all.