Turmeric and glucosamine are both good for joint health. You need to pay attention to which glucosamine supplement type you use vs. what type of joint pain you have. Glucosamine Hyrochloride is best if rheumatoid arthritis is in play. Glucosamine sulfate is better for other types of joint pain. This assumes your joints are the issue. Foot pain can take many forms. For plantar fasciitis, inserts and/or shoes with less flexible soles are best. Morton's Neuroma pain can be eased via cortisone shots and serious time off your feet.
Go get your particular issue diagnosed/identified, and go from there.
^ Yep, not much you can do for flat feet other than a good shoe; definitely work on losing weight and keep walking as much as you can without exacerbating the pain.