Do more research. I have read in multiple places that oak and poplar should not be used outside. And both are pricey. I'm not an expert, but there's a reason most people use pine or cedar.
I am adding some wood siding (105 drop siding) to the front of my house right now. I'm using pressure-treated southern yellow pine (I'm on the Gulf Coast). It much be primed with oil-based paint on all sides and coated with two layers of vinyl paint. I believe pine holds paint better than cedar, as cedar contains so much natural resin.
But again, do a lot homework before buy expensive wood that turns out to be the wrong thing. One thing I do know is that you need to go to a good lumberyard for the best siding materials. And even then, walk out to the shed and inspect the lumber yourself. Don't accept just what's easily available at big box stores.