Take the four stakes and hit them into the ground 12” outside of your patio area using the rubber mallet.
So that your concrete paver patio drains away from your house, you’ll need to account for the slope of the space.
To begin, check if the soil is compacted. If it isn’t, which is likely, use the tamper tool/ plate compactor to tamp down the soil.
Once you have the 4” of base layer, double check that you have a little more than 1½” from the top of that to the top of the marked paver line.