just need to follow the FARs in the US. The only license perse is a low altitude waiver which is issued by the FAA and difficult to comeby but you dont need that anyway unless you are an airshow pilot.

do not practice acro-
Over any congested area of a city, town, or settlement;
Over an open air assembly of persons;
Within the lateral boundaries of the surface areas of Class B, Class C, Class D, or Class E airspace designated for an airport;
Within 4 nautical miles of the center line of any Federal airway;
Below an altitude of 1,500 feet above the surface

and if you are expecting to bank more than 30 degrees or pitch more than 60 throw on a chute. The tailwheel endorsement is not required unless you plan on taking the plane out solo and instruction is not required although it would be near suicide to attempt it without prior training.

I was/am an acro instructor so let me know if you have any questions.