Adding Mods To FiveM, development help needed

hey, i recently have been thinking of getting a server, i tried getting one up for free but it won’t work, i am now going to use zaphosting. my question is how do i add mods like a blood effect for rp? and how do i get custom mods like the back to the future vehicle? i watch jmwfilms and progamerdude and i want to do stuff like them but have no idea where to start. my last question is how do i add custom models, for example JmwFilms had a 4 legged baby monster, i could make it in blender but how would i then give it bones and import it into fivem? I’m not a developer but i’d like to get into it :smiley: