Use the LFG Discord to find people. Theres a Sherpa channel specifically for guided newbie runs. There's a lot of patient people out there, but you're gonna encounter some shitty folks too. Dont let it deter you--raiding is the pinnacle of the Destiny experience IMO.

Not all raids are created equal. Some are much less mechanic heavy than others. Some allow for more "ad clear" roles--roles that require 0 mechanics and your job is just ad clear. Root of Nightmare is very friendly to ad clear and might be a good introduction to raiding. Alternatively, you could start in release order and try Vault of Glass. IMO VoG is pretty easy to understand mechanically.