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Can I use the standard Windows telnet program to access my shell account, or do I have to use the secure SSH client?
You have to use secure SSH client. I advise you Putty:
http://www.chiark.greenend.org.uk/~sgtatham/putty/
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Can I install spamassassin in my account and do you already provide procmail and a recent version of perl?
Spamassassin is already installed on our servers. You can enable it via your Cpanel control panel. Procmail is also installed and perl version is 5.6.1.
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then are those allocations (disk/bandwidth) separate from my main account?
Sure. If you resell our own packages than we don't use the disk space from your reseller account for them.