Normally I’m against buying accessories before you even use anything to see what you even need.
But in this case you’ll need a head strap and a face cover. I couldn’t play mine for longer than 30 min before I got a head ache because of how bad the stock head strap is.
I’d suggest looking into the HTC Vive head unit with 3D printed adapters. It’s the same price and 100x better than all other straps on the market. Looks better too.
As far as the Kiwi cable. I just bought one yesterday for mine finally (after 2 years of owning it) for like $28 from kiwi Amazon direct. It’s the 16ft and the 2.0. Idk how long your is tho.
VR cover
https://www.amazon.com/stores/VRCOVER/page/662E73B0-D8DB-4C87-8F38-45AC32F37FB0?ref_=ast_bln
Head strap
Adapter for Vive
https://www.amazon.com/gp/aw/d/B08P6FPLV7?psc=1&ref=ppx_pop_mob_b_asin_title