My advice to you is to seek out developers who have already published games and find out what worked for them. For instance there's a very good video series from someone who's creating a AAA rpg from scratch called HandMade Hero: handmadehero.org Also check out other places where this has already been answered: quora.com/Can-one-developer-make-a-successful-ind… gamedevelopment.tutsplus.com/articles/tips-for-a-… gamesradar.com/10-games-developed-entirely-one-pe…