I started with jack, jack stands, 1/2" breaker bar, 1/2" socket set and ratchet. I now have quite an arsenal.
Here is an example
The rear brake caliper carrier bolts have a 8mm allen key fitting.1/2" 8mm male hex socket worked a treat. Even if most sets had a 8mm size you would not get the torque to unseize it - The biggest problem when maintaining / fixing cars (seized bolts). Use oil, heat coils, big breaker bars 3/4". Rounded nuts - there are sockets to deal with them.
Front shock absorbers top nut needs a 'go through' socket set. Halfords sell a decent set when half price.
Brake nipples - use a flared spanner to reduce rounding.
What work you planning on doing?