I think it is a good plan. I wouldn't limit yourself to a certain amount of deals per year. If you aren't using your own money to fund the deals and you aren't doing the work yourself, then you can do multiple projects at the same time as long as you can afford the hard money payments. As long as you have a deal that is good enough you should definitely be able to find someone to fund it.
The more flips you do the more you will make a name for yourself and the easier it will be to get funding. In the Phoenix market houses under 300,000 are selling fast so the BRRR strategy as an exit won't really apply unless you love the place as a rental rather than selling it. I also think it's dangerous to bank on appreciation, but in the valley most neighborhoods are appreciating at rates better than 10% annual.
Overall I think your plan is good, but don't be surprised if you reach your goals sooner than you think. Best of luck to you.