Security issues with a used iMac

Hi,
I bought a used 17" iMac G4. Here are my issues:
a) in Keychain Access, there's 3 keychains: Login (which is empty), System (which has 2 Airport network passwords) and X509Anchors (which has 98 root certificates). Is there a way I can get rid of these? Would I need the install CD to do so (which he didn't send)? Can any of these certificates be detrimental to my computing experience (i.e., could one of these 98 certificates allow someone else to access my information?---I've never been 100% clear on certificate topic).
(b) I cannot change my shortname; it is stuck as "admin." I've had no problems before changing this little feature on my iBook G3. Is this another issues possibly related to the install CD?
(c) the first time booted it up, the existing admin account showed, and the admin's name did not match the name of my seller. So now in the back of my mind I'm thinking "this computer's hot! and not in a good way!" --> but I checked with Powermax's Stolen Computer Databse, and it somewhat reassured me that my used iMac is not "hot."
(d) anything else i should do ensure to my security is protected before I start transferring the contents my G3's files onto this iMac?

(b) I cannot change my shortname...
KB 106824, Mac OS X: How to change user short name or home directory name

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