May some guy help me

I'd like to know about the leisure
boat regulations that can be questioned in
Italy in practice (acknowledgement for other countries are welcome).
1. Our
boat is German Flagged and less than 10m (9.65m) length.
2. With my wife, we are Turkish citizens with valid EU visas,
3. Our boat was built in 1987, we don't know about her VAT status, we bought it in 2007
4. We don't have a Grey Tank and
Bilge Tank, only a Black Tank
5. I don't have a
VHF licence
6. is (not more than 1% sulphur)
fuel certificate a must?
Thank you