[Exim] Basic exim domain alias question

I just set up a virtual domain and I want to set it up so e-mail will work
for it. I've already went in and added it to the list of local domains in
exim.conf I added the MX record yesterday but it's still not working. Is
there something else that I'm missing on this?

ALso I'm alittle confused on how to add e-mail names for different domains.
From what I understand from some of the docs I've read I need to go into the
alias file and write it like this for my virtual domains

name@??? : name
name2@??? : name2
name3 : name ##for the main domain


Is this the right way?

Thanks a bunch

Keith
kpettit@???