Technology/Resources for building garage apt

[Luke H.]

Hello, I am starting on the path towards building a garage apt on my lot. I am looking for resources, tools, technologies that will help me make this dream/vision a success.  From start to finish I'm looking to listen, learn, implement.  Please provide any and all resources, hints, ideas, comments on this process.
I am in Houston, Texas so I'll be looking for software to create some blue prints that will pass city inspection.  I'll be looking for software for scheduling the trades, for pricing, tracking, etc.

Feel free to ask questions and thank you all!