New to Medium Format, help with film processing...

I'm new to medium format photography. I'm going to be shooting as a commercial portrait photographer. Can I get by without a darkroom? I know nothing about processing/developing 120 roll film. I have an old enlarger, and that's it. What can I expect to pay for commercial processing of my film? Should I use a mail order company or my local camera shop? How much will it cost for just developing negatives and getting a contact/proof sheet to review, rather than just getting them to print me the roll? Can they do that? Will commercial labs provide me with "artistic" support? like if I need darker, etc...Any suggested reading would be appreciated. Have lots of books, but nothing with specifics in this area.

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