Newborn - best to feed on demand, later on they settle and are predictable enough. While feeding on demand and getting used to the baby's rhythms the ready made cartons are brilliant. Any of the carton not used can be put into a sterilised bottle and kept in the fridge for the next feed. I still use them for first thing while I am still half asleep so I can just take a clean bottle and carton up to bed and don't have to traipse downstairs (he drinks the lot), and I also use them out and about.
Pick a formula - quite a lot come in ready made cartons. It might be worth finding out what's available on your maternity wards - at my hospital there were three or four brands of 100ml (hospital only sized) ready made formula bottles/cartons. The midwives may not be allowed to tell you as it's "advertising" though. The 100ml sized bottles are great for the very first few feeds as they don't take a lot. Also, look to see what you can get from your local always-open shops. If your baby has reflux or bad colic, then the comfort/easy-digest versions usually don't come ready made though. Cartons tend to be a little more diuretic and powder more constipating (which is also why I give 1 carton a day.)
I had lots of the small size of bottle (I was expressing and formula feeding and so was using some of them to store EBM) and 10 of the big which is overkill but allows me to wash up in batches, or wash later one day than the next. 6 of the larger size is probably a good number as they settle to 5 feeds a day typically. I can't remember how many of the smaller would be worth it, it depends on how often you want to wash/sterilise; get a couple and you can always get some more later if you need, whereas the big ones will definitely be used later. I take 2 out with me in case I drop one on the floor mid feed and need a clean teat urgently (it happened to a friend when her baby was being fussy and whacked the bottle out of her hand), so having slightly more than needed helps there.
We use the Avent microwave steriliser as the electric ones just died on us (hard, hard water). Most sterilisers come with some free bottles (BPA ones though) and teats.
I second having a baby-only kettle, though my husband asked why. I also have a baby-only washing up bowl and an area in the kitchen for baby bottles.
A tip for making up powder - use a good set of scales. As you scoop, be weighing it, then if you lose count because someone wails or talks to you or counts backwards you can see how many scoops you've put in by the weight. We found putting the powder in first, zeroing the scales, then adding the water by weight (to get the correct amount of water, 100ml=100g) means the powder doesn't stick to the scoop due to condensation. We also have sterilised bottles in the fridge with cooled boiled water in - make up the milk with just under half hot water thus killing the bugs, shake to mix, then put it back on the scales and top up to the right amount with the cold water - and you've got formula at the right temperature much faster.