... My one question is about the rust spots on the actual bowl, what is he best way to deal with them and keep them from spreading?
Store it indoors. Or, if using it, put some cooking oil on the spots and reapply often?
Rusty grates promote and accelerate rusty grate straps. Banking coals promotes bowl porcelain pockmarks (use charcoal baskets.)
And remove ash after each cook. The leg sockets and sweeps or vents will thank you.