i extremilly suggest you start out with
this set of tuts especially the ones made by fuzz. They will teach you the basics of scar so you really know what you are doing :D this is what I did a couple weeks ago and im writing scripts now :D (havnt released any hehe im a perfectionist :stirthepot:) but yes then definitly look into Yohojos first rs script vid tut and then basically go from there using the tuts that you need to implement whatever you may need. Good luck!
Good Tools:(all found on this website)
Aca.exe- credit to nielsie95 and Sumilon
ODTM Generation Tool(extension of Simba) credit to euphemism
DTM editer - of Simba aswell
Theres a radialwalk script helper made by mormonman that is really useful aswell