(I fixed the header, yer now a Kid
)
It's true that we need to make the decision for change for OURSELVES, not anyone else ... if we want to be successful. Being comfortable and accepting of your body is a big help ... and wanting to lose weight to improve your health is more motivating than just wanting to be smaller, at least I think so.
About vitamins ... you would be well-served to take a good quality multiple vitamin & mineral supplement, such as Centrum or Quest .. there are others. Look for a formula that is "Super" or "forte" ... these have extra B-vitamins especially. There will be a trace of iron in the multi, so there's no need to take more. There is a concern about too much iron for men and post-menopause women .... but for us young'uns, the monthly losses serve to balance things naturally..
... As you've probably noticed, your urine output increases significantly with ketosis and fat-burning, and you need to drink a lot of water to keep the kidneys flushed out. This may lead to your potassium level dropping, and some folks find themselves feeling weak, fatigued, aching muscles, headachey. You can take potassium as a supplement in pill form ... but the cheapest way is to use a salt substitute such as NoSalt or Morton's Lite Salt (in Canada it's called Half Salt) ... these are made with potassium chloride. You just use as you would regular salt, and they work fine in cooking too.
Wa'il has made a good suggestion about the ketone sticks -- just remember they're just a guide ... some folks never get a positive reading, but they lose fat and inches just fine. YMMV (your mileage may vary).
Happy lowcarbing! Keep us posted of your success
Doreen