Buy tools as you need them instead of paying for labor. You can DO it yourself in almost every case! Utube has someone who has made a video of everything you will ever need to know. Get familiar with Utube self-help videos and start checking your local Craigslist every few days for used tools you think you might need.
You will want an air compressor (used see below for capacity and HP etc.) but you don't need to break the bank, a decent strongly built 2X4 and plywood workbench, a nice big vice to bolt to it, used hand tools and handheld power tools, Some used lighting overhead in the garage (no such thing as too much), and some homemade car dollies made from cheap 4-inch casters and plywood.
Everything you need to know at least 10 guys have done a few times on this forum. Start a build thread on day one and ask away. Add your location to your profile, it will come in handy for others to offer local help as well as local retail suppliers.
A used frig out in the garage is a really nice addition as well as an old stereo.
Save every receipt in a three-ring binder in order of date of purchase. You will want to keep the part numbers as well as the vendor's contact information.
This air compressor is enough for a lifetime of work in your garage if you can add a 230V single-phase plug out there. It is just about the minimum capacity to run air sanders and air-powered body tools, If not a 110 volt less expensive one will still work for a lot of things. You should be able to find a used one for no more than 2/3's of the new price.
$500-600 would be my target.
Ingersoll Rand Single Stage Stationary Electric Compressor is a reliable and efficient compressed air system for commercial or industrial use.
www.homedepot.com