Come on people, this poor man just wants to play with a NAS and figure out how it works. Power to you.
One thing about FreeNAS is it likes having it's own disk to boot off of and it's own disks for storage.
Once you got your prereqs boot into the shell interface and run "ifconfig". That'll get you your ip info.
Now you can log into your FreeNAS server via http or https (recommended). Your default username should be root and the password is what you set.
After you're in, Storage -> Pools to create a storage pool and Sharing -> SMB shares to create a share.
Edit: OP, if you have more questions just quote me. I recently finished building a FreeNAS server so all the info is fresh in my head ?