Which log do i check for server load and where is it? Or is it every log?

Thanks in advance

If you have a control panel (like cPanel), it keeps a log. Other wise you will have to install some custom script. Try looking for one on : http://www.hotscripts.com

The best way is to install mrtg + snmpd but it's not so easy for a newbie.

CretaForce, Isent mrtg only for bandwidth usage ?

http://perso.wanadoo.fr/sebastien.godard/

Check into that it will monitor your load and create a log.

Your best bet is to use MRTG and get it to give you pretty graph.

That's what I have done with my server and it works.