Why not establish the online business that will make you $2-3k/month asap, then get your ass over to Ho Chi Minh City, China, or another hotbed of mobile entrepreneurialism and work on the concept that will make the big bucks? Sounds like you have two specific ideas in mind, and that's great, but there are many more possibilities out there.
Dr Johnson rumbles with the RawGod. And lives to regret it.