Creating a simple clone game can be relatively easy to do if you have the skills to program and make/get art assets. The problem is that you won't be able to make much money off something like that. To make a game that becomes viral and makes money for you, you'll need to spend lots of time on it.
My advice to you would be to make a few simple games (from start to finish) to get a feel for the amount of work that is involved. Once you have that under your belt, draft a design/plan for the game that you want to make that you hope will make you some money. You can then plan out how much of the work you can do yourself, and how much you will need to outsource to get it released when you want to. Remember, marketing your game is a big part if you hope that people will hear about it and buy it. Making a game and releasing it won't make you any money if no one knows about it.