my wordpress website

hello

I am looking to start up / launch a travellers blog website using wordpress. the general idea is that visitors will register and then upload a blog to their profile with maybe images etc of their travelling adventure ie a trip to paris etc.

I really need a theme suitable to use on my site. my site is currently just a domain name im looking to go ahead with the launch sometime within the next month. as well as a theme i have been looking for a membership plugin that will allow visitors to register as members.

i have looking at memberful as an option. ideally a free plugin would be good as my site will be free to members.

please help with some advice and helpful pointers if you can

michael