Display only posts from current year on main page

I’ve got a multi-year blog going, and since all content is based around annual trips, I’d like the main page to only show posts from the current year (in this case, anything written January 1st, 2007 and later) and maybe even the very last post from the previous year.

Additionally, I’d like an archive page that contains full archives of the entire site, broken down by year.

I’ve searched plugins but haven’t come across anything that seems suitable. I’m willing to try new code, I just don’t know where to put it!

Thanks.