There are a number of posts that help get you started - This one was a big help
showthread.php?t=4887
You should be able to log in to the admin section if you have it set up right - the username and passwords are the one you set in the WA_Globals file. If you did NOT do that, then you haven't set the CMS up properly. I found an excellent pdf which explains it very nicely but I could not remember the post on the Webassist forum where I downloaded it, it exceeds the max file size to attach it to a post - it is only about one meg so if you need it, I would gladly attach it to an email and send it to you - just send me a private message.