Damojo Hey there and welcome! My advice is pretty much what everyone else has said: read the website and reread the website, then when you start growing read the section for each stage of your grow as it progresses.
Other than that BEFORE you buy anything sit down and write your immediate expectations/goals for your first few grows. Mainly for me, it was yield: how much pot will I have per harvest and will that last me till next harvest. Once I had that number, I figured out how many plants I should grow to achieve this yield and how much light will it take. This will help determine your grow space, lighting, exhaust, planter size, etc.. I wish I had done this more throughly before I started because my entire set up (tent, lights, ventilation) changed over the course of one grow because I didn’t take the time to asses my goals before I started.
Finally, I use LED lights, but if you have the space I would suggest starting with HPS/MH lamps as it truly is the simplest way to address (in my opinion) the most complicated part of growing weed as there are way less variables. You WILL go over budget, but if know how much light you need for your plants, going the HPS/MH route will take a lot of guesswork out of your lamp selection.
Good luck and send us updates!