You need to take care of the treads risers and stair noses which can get a bit complicated at times.
How to do laminate flooring on stairs.
Here are the steps for installing laminate flooring on stairs.
To install laminate flooring on stairs start by removing the overhang or the underside of the stairs with a jigsaw.
You have to ensure that there are no gaps and spaces in the flooring and it is complete and perfect in every way.
Once this is done measure and cut out your pieces of laminate to make tread pieces riser pieces and stair nosing.
Laminate flooring installation on stairs.
Things i mention in this vid.
Alternatively you could cover the overhang with plywood to make it level.
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However installing laminate flooring on your stairs is a completely different matter.