Soil/soilless or hydroponic growing media. Lights. Air circulation. Ventilation.

A word on that last one; depending on what your living space is like, one of the big requirements that might not be immediately obvious is some exhaust fans to remove heat from your system. People with even modest lighting setups who are just letting their home HVAC system handle the extra requirements are going to notice the load. Honestly maybe just wait for the cold months and let your grow help with your heating needs lol.

I’ve never done this but I’m sure there are relatively secure and light-proof ways of rigging exhaust ducts to a window you keep partially opened. Or for bigger systems or people go as wild as running duct through an attic and exhausting outside, but like I said that’s far out there.

Grow tents of various dimensions are quite a popular solution for creating indoor controlled environments and they are cheap and cheerful on the various online retailers. IME people can look at them and think they are portable clothes closets, if they don’t notice all the wires and ducts you’ve got running out of them, and the fans humming and lights glowing lol.

For processing, if you aren’t concerned with keeping maximum production going at all times I think that drying your flowers in the same tent you grew them in after harvest is very straightforward, you’ll already have something set up for exhaust and maintaining the right humidity by managing airflow.

Edit: For how to grow, hydroponic may be your best option indoors even if setup is a bit more involved. It spares you having to lug bags of growing media inside, just have to keep track of salinity and pH of your nutrient solution. bourgeoisie_burgers mentioned ebb & flow, another option might be deep water culture or DWC. Picture a 27 gallon (102L) plastic tote with an aquarium pump providing aeration through an air stone, then just circular holes in the lid with little pond nets in the holes with a tiny bit of perlite or clay balls for the plant to start rooting, and all the roots growing all into the nutrient solution.

For lights, LEDs seem like the current wave. High output fluorescent is also an option but to get a good light intensity for flowering you’d really be cramming them into the space. IDK if high pressure sodium lights are still the gold standard but then you’re looking at higher startup and running costs and dedicated cooling for the fan hood, in addition to the exhaust you’ll already want for your growing space.

These , very expensive pieces if plastic but it works amazingly well. I will look up link later can’t remember the name. But eb & flood systems with air pump. Edit: https://autopot.co.uk/ and they can be used for both hydroponics and regular soil. Plants get exactly the amount of water (and nutrients if hydro) . No need to keep carry a water can. Freeze all prunings fresh and make hash out of it , recommend looking into bubble hash to get best results. From there it can be made into resin later. My vape juice is not bad and made from trimmings alone :) also if you want to buy a tent I have one left over I just use for drying which is a bit of a waste use for it. For lights go with LED, will save a lot on electric bill. Dimmable is nice. Fans and and exhaust filters are usually cheaper as generic than from cannabis focused companies. You can also go down the DIY road if you want , I like it but would end up at same cost for me , but plenty of options. If hydro , pH balancing you get from the pool section at supermarket , same chemicals marked up 2000% at growshops. For soil you might get away with some lemon juice if to alkaline soil. Maybe worth checking pH levels in soil. If way off the nutrients won’t be absorbed into the ladys. And as Mickey says other options are also ther if you go hydroponics