Advice on entering IT Field

Hi,

I am needing some most valuable input from all of you IT Pros on entering into the field. I am 46 and at a major cross road in my life with a career. I am prepared to start at the bottom,pay my dues, and work my way up. I need some direction as where to begin. Hopefully my age will not be a major hurdle to overcome, but if it is so be it. TIA for any responses.