New crate engine for Suburban

Hello,
I am in the process of swapping out my 99 burb's engine for a brand new GM crate engine. I'm going over it with a fine tooth comb and want to do the best job I can. So I have a few questions:

1) What are the best spark plugs and plug wires to put in?
2) What's the best way to set the timing. Without taking it to a shop.
3) My exhaust manifold gaskets are in good shape, should I replace them anyway?
4) Should I go ahead and use regular antifreeze?
5) Any secrets on making sure the intake manifold doesn't leak?

Thanks a bunch for any help, Buddy