What web hosting package will I need?

[inder]

I am going to start a chat and dating website (using SQL, PHP etc.) and was looking for a web site design company
with a suitable hosting package for my website. But I am confused what sort of web hosting package I would need to host the site? Do I need a dedicated server? Can I use a virtual one? What should I look out for from my host? I can’t predict what sort of traffic I'd have, but I'm being optimistic and hoping to sign up several 1000 users monthly (the host would therefore need to cope with several users being on-line at once). Can anyone give me any advice on this? What sort of traffic can I expect? What sort of band width should I look for? The site won’t have provision for webcams initially, but this may be an option in the future. Users will be able to upload photos, videos and music on the site too (with limitations). Any help much appreciated. Thx