Amateur built is in a higher category than Advanced, you can fly an Amateur built aircraft aircraft with an Ultralight license, (or any aircraft for that matter as long as the aircraft is with the weight category)
I believe you cant have passengers for the first 5 hours of the 25 hour flight testing, after the 25 hours you will get your certificate of airworthiness and are able to do
anything your license allows (Carry passengers if you have a carry passenger endorsement, provide flight training if your a CFI, and so on)