Forum Moderators: phranque
Getting people to use it, and marketing it is a very different matter.
It is very very difficult and takes a lot of expertise.
Are you sure it's the right thing for you?
TJ (Devil's Advocate)
Don't take this the wrong way (I'm still just playing devil's advocate) but with the questions that you're asking I would suggest you set your sights a little lower for the moment.
Develop something simpler and use it as a learning experience for website development, branding and marketing.
These are all skills which are fundamental to launching any kind of portal.
TJ