Longtimer, no one can tell you how it will go for you with certainty. But some things are going to be helpful pretty much for everyone, and others harmful for everyone.
What is helpful is eating a really good diet, and that is different for everyone. I eat meat, don't do well without it. Others swear by a vegetarian diet, and that is what works for them. You will only know this through your own experimentation, but whatever you eat make it nutritious. Severely limit sugar, and even more severely limit your alcohol intake, as that will make things worse.
The other helpful thing is exercise. I personally think exercising outdoors is the top way to get your exercise, but admit that may not be practical for everyone. Taking walks or, if you can manage it, hiking, is probably the best and easiest (and least expensive!) thing you can do. I found that I had to work up slowly. I had always been an avid hiker, but when I developed Fibro., I stopped feeling like going. For a while there all I could do was try to manage the pain with medication. But I found that when I pushed myself to get out and start working up to hiking again, things really got better. I suggest that you try doing whatever outdoor activity you like best on a regular basis.
finally, I want to clarify that I don't eat anything fancy! I am on a budget, and also I don't really like to cook. So what I have done is work out meals that take the least amount of time to prepare, and are highly nutritious, and that is what I fix for myself on a daily basis. Make everything you need to do for yourself as simple as possible, so you will do it regularly. Best of luck.