Quantity of paint required

[AngryPirate]

I'm planning on doing 2 component, single stage urethane and I was wondering how much paint is required and what the minimum amount of coats that are recommended.

I plan on doing a 2 tone scheme for a 1960 GMC, but we don't necessarily need to get into that kind of detail.

What I plan on painting:

- firewall
- entire exterior
- interior of bed (sides,back,front)


Thanks for the advise.