It is easy for everyone to track the basics.
There are lots of ways to do this but many people like using apps like My Fitness Pal or Chronometer. Try hard to be accurate. The more accurate you are the better you will be able to hack any issues that occur. Not everyone needs to weigh and measure everything. That said it is better if you do in the beginning to help you learn what 30 grams of cheese looks like. The only people for whom this is very important specially in the beginning are those of us who use a ketogenic diet therapeutically. And everyone should at least track carbs.
You don't have to exercise at all. BUT it is good for you. Pick something you like to do and do it. Walking, lifting weights,cardio whatever you like and write down what you do and how often you do it. Challenge yourself to do SOMETHING for 30 minutes a day. At the very least get your face into the sunlight for 30 minutes each day.You will be surprised at the impact that simple sunlight can have on your overall health.
Haemoglobin and Ferritin
Inflammatory markers ( ESR, CRP)
Vitamin D3 (25-hydroxy vitamin D )
Ask for a copy of all of your most recent labwork. Make it a habit to keep copies of all of your tests, they are yours after all you should have them on hand and learn how to interpret them or reach out to those who can help you understand how they all relate, what might be missing , and how sometimes what looks "normal" isn't (more on this later). Be sure to track anything else that you may have been tested for that is specific to your disease/symptoms.
DXA- is a great way to measure your bone health, lean mass and fat mass before you start on this journey. They are fairly easy to obtain and often, if you tell them you will be coming back in a year, you can get a discount. Just type DXA or DEXA and your city and I am sure you will find a location near you. Just be sure to repeat your DXA on the same machine as your baseline for accuracy.
NMR - This is a next level test which looks at the type of lipids that you have in your bloodstream. It measures particle size and number which a standard lipid panel does not.