Good questions, and all I can say is your experience will vary. Some shops provide a lot of service, free tune ups etc, and some don't. Inquire in your community as to what shops people like, and why. At minimum, basic fitting for saddle height and cockpit should be done but the degree of how fine tuned this is depends on the shop. There typically isn't a service plan - but some shops will offer free basic tunes for the lift of the bike, or a year. And you bet they should try and fit the bike to your needs as a rider.

Good luck and happy shopping.