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Congratulations on starting your own practice and getting your first commission!
I use the AIA B-105 owner-architect agreement for small projects. I've added quite a few clauses to flesh out that document based on past experience. Also, I suggest talking to your insurance carrier about clauses they recommend, i.e. limitation of liability. It also helps to include a list of services that are specifically excluded from your scope of work, i.e. detailed estimates of construction cost.
Best of luck in your new adventure!
Kendal W. Perkins
Architect, AIA, MBA
Apex Architectural Services, LLC
177 Shamard Drive / Natchitoches, LA 71457
Tel: (318) 581-3237
Isn't GOD Good?