Foreign (F40)

I’m tired of doing physically demanding work; I’ve been working since I was 15, and now that I’m nearly 40, my body just can’t take it anymore. I suffer from chronic back pain that is affecting me both physically and mentally, and my heavy job certainly isn't helping. I’m so used to working that stopping working isn't really an option for me, but I’d like to work from home instead of doing heavy labor job. I’m seriously considering taking a course/Uni/SRC—what would you recommend? I’m a quick learner and I love working as a team.