require plugins or help

Hi,

I had a few  queries. Hope you solve them

I am building a website to give info and classifieds of a place. I am using hathor theme

My website address:

http://Www.arnabindiaphotography.in/photo

Firstly, i want people to login and post on different pages. Can this be done.

Secondly, can people put posts with photographs and contact numbers.

Thirdly,  can the recent advertisements be shown or the highest commented on that page.

Fourthly, how to add photos to the sidebar in hathor free theme.

Thanks
Neelam