Multiple issues regarding WordPress site

Hello

I am designing a website, My queries are:

a) I want the front page to appear like this http://www.bbc.co.uk/ (BBC hompage), like multiple boxes in which my different categories would appear. one box for sports, one for news. How is this possible, i cant find any plugin for this.

b) I want registration of users and login page on the front end, i dont want users to know im using wordpress behind the sites. please suggests some plugins.

c)I have some sub pages and I want them to come in dropdown on the top menu of pages, like my parent page is “advise” and subpages are “alpha” and “Beta”. But on top menu when i take my mouse on advise, it donot dropdown and shows alpha and beta.

Please help asap. I am in need.