2006 Infiniti M35x

[lehechet]

Hello,
I have a question.
I want to buy a 2006 Infiniti M35x 78000 miles. and that will be my first car.
Do you have any ideas what i should look?
should I need to doing a complete maintenance regularly?
for that kind of car, how much is the average for an complete scheduled maintenance.
Do you have any ideas how much it could be per years for a complete regular maintenance?
Thanks
Raymond