bluGill

A friend with a good set of tools. Who you can trade labor with. Many car tasks need 2 people so if you can hang out with someone else working on their car and they return the favor you are greatly ahead. Not only that but you will teach each other (well at the start that person will teach you - do plenty of work to pay them for their effort to teach you).

After that tool do you need for the current job that either your friend doesn’t have or you use so often it is worth having your own. Every car has its own set of special tools that are not used for any other car you will ever have but you need it to do some job. You will need several torque wrenches as they have different ranges, but you won’t need them all for the first project.

Better than the Haynes manual, buy the factory service manual - they are generally $200 or so, but they are so much better than Haynes that it is worth the cost.