the best thing you can do is find an airport that has VASI lights and use that.
Most big international airports have them.
Even some medium small airports have them.
If you are flying a big jet, you would land at a big airport and you wuold use the PAPI lights which are more precise than the VASI lights.
the VASI lights are 2 lights side by side. If you are too high on your approach they'll both be white. If you are too low they'll both be red. If you are on track one of them is white the other one is red.
They are usually positioned on the LEFT side of the runway, just a little past the end of the runway, close to you while you approach.
General rule of thumb is, if you see them both red, you are in big trouble. If you see them both right you might miss the runway but you won't crash.
The PAPI lights are similar but they are for BIG airports.
This is the way they look like:

There's 4 of them, side by side. One red and 3 whites means you are on the upper end of the track (it's called glideslope by the way ... the correct path to be on in order to land safely).
2 reds 2 whites you are ok.
3 reds 1 white you are getting too close to the bottom
4 reds ... you are about to get hurt.
hope this helps!