After being retired, I decided I needed a job but because of caring for a love one, I could not work away from home. I did some research and tried a few. I found most work at home jobs fell into the following categories:
Telemarking - I tried a couple of these jobs and found they were not worth pursuing because you worked on a commission and the products you were selling were too hard to sell over the phone. It was just a lot of work dealing with people who didn't want to talk to you.
Business Opportunities - Most of these were either rip offs or require money or skills I didn't have. Be very cautious of any advertised business opportunity. If it were really very good, they would not be advertising it.
Skill based jobs. - These jobs require certain skills such technical or customer support, web page design, writing copy for varies organizations, computer graphics, bookkeeping, etc.
If you want a real job working at home consider your skills and experience. Write a resume and and contact companies in your area You may want to pitch a service that you can perform at home.. You should tell the company what you are capable of doing and your need to work at home. Small companies that can't afford full time help in an office may be willing to hire you or contract for your services.
Lastly if you are just looking for some work to do and don't care about the money, check out some volunteer organizations. They may have some type of office work or fund raising that you can do from home. I've done quit a bit volunteering after retirement and found it very rewarding.