Welcome @donny420 , you are off to a great start just by being here on this forum! There are a host of friendly helpful folk that will listen and offer their experience if you ask. It sounds like you have been doing your homework by studying and reading about growing which is the best way to begin. The main GWE site offers a wealth of information and Nebula's tutorials are second to none. I'm also new to indoor growing, in my 3rd week of flowering now and my ladies are doing very well because I read everything on the site and then joined the forum and read here before I started.
You're right on track by starting your plan with strain, medium and lighting. Your basic food groups if you will, lol. I started with photo period as they are much more forgiving of the mistakes you will make as you go and trust me, you will make some. Usually nothing fatal if you're careful and thoughtful. I decided on coco with 30% perlite in cloth bags as I felt I could have more control over nutrients and watering and it has paid off so far for me. Lighting will be your biggest expense and most important factor in your grow. A full spectrum light is a wise choice and I would advise not getting a Blurple type light. A 2x2 is a small area so most lights will cover that space well with full coverage in the flowering stage which is the most critical time for good lighting. Actual wattage draw from the wall is the spec you are looking for, not some claimed figure that is advertised. I think about 300 watts actual draw power will serve you well now and in the future because you will want more space later. Again ask here before you purchase if you are in doubt. 2 plants in 3 or 5 gallon pots would work best in your small space. 5 gallon will fill it very tight and 2 plants will crowd it sure when they mature. Good luck, Study and ask more questions and you will succeed!
Three from seed plus one clone from a top when I started my manifold training. Just before the switch to 12/12. 2.5 x 4 x 5 ft DIY Cabinet 3 x 100 watt actual draw quantum lights, full spectrum.