Follow your recipe instructions the best you can, try to avoid modifications. Some changes or advice may be misleading, such as it's better to boil 5 gallons instead of the 2.5 or 3 or whatever your kit recommends. Sure there are advantages to a fuller boil, but your ingredient kit is most likely designed for the amount of water it tells you to boil, you will end up with a different then intended flavor, you might make a mistake such as steeping your grains in 5 gallons of water, or even worse your stove might not be able to boil 5 gallons of water. This is just one example for why you should stick to the script.
That leads me to another piece of advice, do a dry run, do things such as boiling water and siphoning beer and checking a hydrometer reading. Seems pretty easy, but if it's so easy, why are there so many posts on here where people screw up the simple stuff?!?!
I try to read my recipe top to bottom at every step, if I am on step 7 of 10, I read steps 1 thru 7, that way if I missed a step, I can find it sooner then later.
I also suggest the book "Joy of Homebrewing" and for a first beer I'd suggest a Brewer's Best Kit, they don't have fancy names, but they also aren't beer in a can. Everyone I've seen has extract and some grains, provide bags, yeast, hop pellets, and even caps. The instructions are very simple and they provide places for record keeping. A plus is you can look at their recipes on their website, so you can ask questions before you even buy the kit.