What to do prior to laying paving stones...

Clear out all the grass and leaves, etc. Spread levelling sand. Lay pavers down. Fill in between with hardening/finishing sand. Brush everything off very lightly. Water/mist the finishing sand to let it harden.

Voila

You can spray poison but I wouldn’t recommend that. It can carry over into other areas of the yard and kill grass/beds.

Besides the above tips of using sand to float your pavers and make them level I would recommend putting ground cover sheeting under that sand so that in five years you don't have weeds growing up around your pavers.

It's cheap, easy to install, and effective.

I know you were trying to be funny and all, but your comment doesn’t even make sense

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What to do prior to laying paving stones...

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Make sure that you have the money to pay the contractor.

You better lay some plastic down under them unless you want those vines, weeds and grass growing up around them for years and being a pain in our arse

You will want a 4" compacted base of 6/10 limestone extending 6" beyond the borders. Bring the limestone in 2-3" at a time. Compact each time until you have 4" base. Then, add paving sand. Screed it. You want 1" or less of sand. Then, without stepping on the sand begin laying pavers. Add edge restraint. Sweep polymeric sand into joints. Run compactor over pavers. Use blanket so as not to scratch stones. Keep doing this until joints are filled. Follow instructions for curing the polymeric sand. When done you can marvel at your genius.

Or, you can just throw pavers down on too of dead grass and call it a day. Six months later you will regret it, though.

t to do prior to laying paving stones... drink lots of beer

Level out dirt

Compact

Put down visqueen

Use 3" sand

Compact

Lay stones using sand to level

Compact and fill like the guys above said