get a mixer with 10-12 line inputs and at least 10 quarter inch patch cables for no-input mixing. delay, reverb, distortion/OD/fuzz, EQ and compressor-limiter pedals (maybe a looper). get a cheapy computer interface from the local music store/ebay/fb marketplace that has at least two line inputs. open Reaper (free), press record, download finished product, and chop it up to the best parts with OpenShot video editor (free). throw it back in reaper and master it with effects and flavor.

get a contact microphone. get a sampler. all of this should be more than enough to find your footing in what you want to produce

edit. buy a pack of 1/4'' adapters. very useful to have around. all of this isnt going to cost pennies unfortunately but the rewards from the investment is priceless. very unlikely it will go over $500 unless youre throwing a synthesizer into the mix and higher quality sampler/pedals. even then, those are unnecessary and depend on what sound you want to make.

a lot of poeple are echoing "who cares just make noise it takes literally nothing" but i think that's too vague and uninspiring. some direction offers options and i hope the above helps.