How to write a login->iteration(action) testcase in SOAPIUI

Hi,

Thanks for such a stable and powerful tool .
I am kind of OK with the testing tools like LR and webload. I was trying to do a small scenario with SOAPUI.

I have to try a webservice loadtest with a testcase which has 2 web service requests.
The first one is a login soap request which will be executed only once and it returns a session id.
I have to use this session id in the next soap request. The second request also gives another session id, this one i have to use it with the third request and so on.

how can I implement this with SoapUI.

Please help me in learning SoapUI.

Thanks in advance...

Thanks
Ranjith