Hi Buffalo Gal,
Can´t speak for Bruce but now you made atleast me a little more confused.
As I see it, if a cpanel to cpanel transfer of your site is possible (only the helpdesk here can answer that, so please submit a ticket and ask, put N/A for all required info you don´t have), it would probably be the best.
With #2, do you mean it might be best to transfer only the domain but rebuild the actual content from scratch?
The domain question is basically correct. No matter you do a cpanel to cpanel transfer or rebuild the whole site here on a TCH server, you would need to have the domain point to the TCH server your account is on, so yes, you would need to tell your registrar to point it to the nameservers mentioned in the welcome email you receive when purchasing your TCH account.
How your current host and registrar handle this is something I unfortunately can not answer.
I hope this made more sense, otherwise please let us know.