1. Keep it simple with nutes don't buy everything on the chart. The "advanced" and "pro level" charts are marketing tools to sell you more sugar water.
2. Liquid nutes are for suckers, your paying to ship 98% water
3. Don't go cheap on your lights, its not worth it. Trust me, you'll end up buying the light you really want anyways. Plus lights will make or bust your yield and quality. Don't buy the 1000w led on amazon for $59. Look at the true wattage draw. Stick with reputable components like Samsung diodes and meanwell drivers. Great beginner lights can be found for 150 usd.
4. Hydro vs soil...hydro hydro hydro. Bigger faster and heavier yields. 100% control of the growing media at all times means easy and immediate corrections. I'm playing in the soil right now and while its cool to say words like organic, nitrogen is nitrogen.
5. Photo vs auto grow both, I'm leaning towards photo as I like to control how long the plants veg for and if I fuck up something I can veg it a little longer to recover. Autos, if you want a potentially and I mean potentially faster harvest, these usually do the trick. Make a goof on an auto and it could be lights out and you end up with a 6" tall 8g harvest.
6. Look around, get ideas from everyone and see what works for you. YouTube is a friend. Ask people on GD. Most of us are friendly people.
7. Don't be lazy. Don't neglect checking your plants for a few days. If you grow in hydro get a ph and ppm/ec meter. Don't even try with out one. Soil, not really needed as much.
8. Don't be afraid to screw up and make mistakes. If You aren't making occasional mistakes, you aren't learning. Carelessness however is another thing.