What and when do I start signing up for benefits?

[4Trixie]

I just turned 61 yesterday.   Do I need to start sgining up or looking into benefits for retirement soon?  My health is good and I intend to work for several more years.  I need to work as long as I can, I did not start working until I was in my 40's and at my particular job when I was 45.  I just need to make sure I get signed up for everthing in a timely fashion, so that when I do retire, everything will be set for me.