A focused technical conversation about one decision — not a general introduction and not a sales call. You send the pre-read material beforehand so the session starts with the actual problem rather than with context-setting.
The deliverable is the written output afterwards: a marked-up version of your document with comments. That is yours whether or not you engage Ibrahim for the follow-on work.
If you do not have all of it, book anyway and say what is missing. Turning up without material is still more useful than guessing at a scope on your own.
21 years delivering welding procedure development and corrosion protection work for aerospace and manufacturing clients. I work to ASTM B117 and AWS D1.1, deliver in MATLAB and SolidWorks, and hand over a complete, checked document set with a clear design basis so your reviewer or authority can follow every assumption.