In terms of qualification.
As its a private flight, in theory you need a ppl with an MEP rating and a class rating for the particular type of aircraft.
That would allow you to fly VFR, which may not be a lot of use.
To fly ifr outside the UK, you would need an IR of course, theory and flying course.
If its N-reg, all the above could be done in USA to FAA standard.
Again if its purley private, I dont believe there is any need to get a CPL.
In terms of experience... I cant comment.