Help using an architect for rehab property

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Hello everyone. I had a few questions I wanted answered about using architects. I wanted to do some big rehabs down the line, and thought having an architect would be helpful.

1. How are architects paid? Do they get some percentage of work, or are they just paid some flat fee? Are they really expensive?
2. How does the process work when you use an architect? Do they usually have the contractor contacts, or do they just hand off the project to you when finished?
3. Could someone walk me through the process of using an architect. I mean from the first call to completed construction.

Thanks.