Me personally, I'd tamp down the dirt a bit before adding the gravel/sand. You're going to need a plate compactor anyway for the gravel.
This is how I'd do it:
1. Excavate and level ground where you want the interlocking pavers.
2. Run plate compactor
3. Place gravel and level it
4. Run plate compactor
5. Place interlocking pavers
6. fill in between the pavers with sand (cover the whole area with sand, then clean off the top.)
7. Party!
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