I know you can’t wait to receive your E-P1! So why not begin to read the manual?
http://www.olympus.co.jp/en/support/imsg/digicamera/download/manual/pen/man_ep1_e.pdf
And there are manuals for every E-P1 accessory and lens!
http://www.olympus.co.jp/en/support/imsg/digicamera/download/manual/pen.cfm