here's your manual
ftp://download.intel.com/support/mot...0/73308201.PDF
Save it for future referance its hard to find.
I recommend going here
http://corsair.com
And use their configuator to find ram for your computer.
You would also need to use a ide hardrive and I don't recommend more than 80gig.
One word of caution though, this is a very old computer and I doubt its worth the money to upgrade especially the ram because it won't fit another machine if you get a new one and can be expensive.
A ide hdd could possibly be used in another machine in the future if you decide to get one but all in all I would save up for a new build