Hi Vicky,
You can always upgrade to a higher package and pay the difference so don't worry too much about the space etc. That would take 2 minutes for support to do.
Regarding web site hosting builder, I would be interested to see what you have already to say whether you need this. There is an editor in cPanel which allows you to modify sites.
If you could give us the full domain name, it would help us tell you what you need and don't.
