Hi ----first of all, i am seriously new to this. i dont know the first thing about setting up a website besides buying the domain name

i have some questions to make sure i have everything i need to get my site up and running well.

1) i make my own domain name and desing my own site then install your script and get my hosting from http://www.hostonnet.com/ffmpeg_hosting.php?

2) or does the script have the design i need in it?

3) will my site allow for individual user accounts (with profile names, passwords, profile info, comments, etc.)
i also need to be able to accept payments on my site, paypal is fine, but i also want to be able to accept payments straight from the users credit card
i will also need automatic emails to be sent out to users, for registration, payments, etc.
does the script have a customer support page for questions they might have

4) will the site allow users to upload any type of video file straight to my site fairly easy?
5) will the site run like youtube where there are categories, searches, key words, etc.?
6) who maintains the site? does http://www.hostonnet.com/ffmpeg_hosting.php provide site maintainence, and whatever else we need to keep the site clean and fresh?

please reply. and thank you.
i hope i can use your service in the near future.
lastly, if there is anything else i need to know, please inform me.