Hi hon, congrats!! I'm kinda jealous in a way that you've still got it all to come!!
The tin will have instructions, but basically these are the steps:
1) Boil kettle
2) Allow kettle to boil for 25ish mins. Formula needs to be around 70 degrees to kill the bacteria within it, but if it is much hotter it can also kill the nutrients, so a wait of about 25 mins / half hour is best
3) Add the correct amount of above water in your sterilised bottle (for SMA its 30 ml per scoop of formula, not sure about other brands)
4) Add the correct amount of scoops to the bottle, having levelled off scoop with a clean knife
5) Add teat / lid and shake well
6) Allow to cool in a bowl of cold water for a few minutes, as it will most likely be too hot still
7) Test a few drops on your wrist - warm is good
These instructions will also be on your tin so don't worry
There is a lot of controversy these days about premaking and storinng, but many ladies will tell you it is not possible to wait 30 mins for the boiled ater to cool when LO is hungry. The WHO suggest making as above, then storing in the fridge for no more than 24 hours. You can rewarm the bottle by standing in a bowl of hot water or using your warmer.
Many babies will take milk at room temp, mine will only do this if she is starving and much prefers it warm.
I think thats about it, will reread your post just to check I haven't missed something