Making a new idle rpg with no manual character movement i am fresh on this project and i am almost entirely new to making games in general

if i am being honest with you i am looking for suggestions and general help on this subject i am very invested on the weekends and i want to make doing this a hobby for me over a long timeframe and my end goal is to have a fully furnished game by the end of the year that i can still grow on and update in the future… i was thinking a more legend of slime type of game but post apocalyptic with zombies and guns, any ideas and start ups i can try to find or figure out?? let me know!!