Interested in why the 500 would be your first choice of a turbine endorsement, unless of course you have a specific need.
Enjoy the shake rattle and roll of the 500, let all the pilots tell you what great fun it is to fly and let all the engineers tell you what a dog of a thing to work on. After all that hop into the old 206 and realise why they are more versatile and less fatiguing.
As far as advice, make sure you spend a good deal of time inspecting the rotor head and are familiar with the damage limitations on the strap pack.