1) any of those will work. Your choice. If the subflooring is OSB, I prefer staples as they hold better than cleats ( fact, not opinion ). Cleats supposedly break tongues less, which is a problem with B. Cherry. So, if you have a good plywood subfloor, I'd recommend cleats. The length should be 2", which is the recommended length for all 3/4" solid T&G flooring, except when going over plywood over concrete.
2) 14' wide is not real wide. To save yourself from having to face nail both sides, I'd start at one wall and work across the room. It will be fine. The flooring is not going to jump off the subfloor. I rarely install from the middle of a room unless I need to. In this case, you don't need to.
3) Any species of spline is fine but a hardwood is recommended. However, you may not need it.
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