Before I launch my faucet, I've try it first to make sure it works properly.or you have any suggest for this? It's would be nice

Using
FaucetBox for direct payments would work (FB will only send out after it hits a threshold). Or you can also save up until people hit a threshold (5500+ satoshi).
so the minimum of blockchain transaction is 5500 sat right?
I have another idea, thanks for your suggest

Yep! And NP.