Planning an Indoor Growing Setup: What Equipment Should I Prioritize?

I’m planning to put together an indoor growing setup and I’m trying to understand which equipment should be prioritized first. Lighting, ventilation, growing media, nutrients, irrigation, and environmental control all seem important, but I’m not sure how to choose the right combination for a beginner setup.

I recently came across https://hydro-land.co.uk/ while researching hydroponic and horticultural equipment. Has anyone here used their products or have experience building an indoor setup? I’d be interested in hearing what equipment you consider essential.