@Chris Vogel Your business plan should be based on three things:
1) What you find fun and interesting
2) The strategy that will help you meet your long term goals
3) Filling the needs in your particular market.
It seems to me that you have already answered the first question, you want to flip homes. This is a good first step. You have identified what interests you now you need to do a little digging in that investment method for your particular area.
You ask about which investment strategy is best, in reality that can only be answered by you. If your goal is monthly steady income you buy rentals, if your goal is to increase your annual income and you do not care if it is steady flipping and wholesaling may be the areas you want to focus.
Once you have defined the first two parts of the strategy you need to look at your market and figure out which market needs you can fill with your desired strategy. This may require you to tweak your plans a bit, but you can always find niche that fits you in almost every market.
The most important thing to remember in all of this is that your investment strategy is a living breathing entity. As your tastes, goals, and market change you may find your investment strategy will change as well.
Good Luck,
Allen Fletcher