Chown, File Ownership

#1
I moved in my site via a tgz file, unpacked it, on my old host the ownership of all files and folder was "webadmin webadmin", the system here obviously didn't recognise "webadmin" so they all have been assigned ownership of "unknown unknown".

Is this going to be a problem, do I need to change them all away from "unknown"?

If so what I should i change them to? There are so many different options. By the way, I am the only person using the server, there are no sub-accounts, the "users" are just me.
 
#3
Ok thanks grecacer, I did that, from the mydomain.com directory I did

chown -R myusername : psacln httpdocs

Is that right, myusername and "psacln", is "psacln" the one to choose for Group?
 
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