if your just learning, anything is fine really. when your new, how well you board is more determined by your skill level than your equipment. when you start jumping around a lot and hitting mach speeds is when youll notice the differences gear can make.
the board is definitely on the short side, but that can help novices in that it will be noticeably more manuverable. the flex ratings won;t make much difference yet.
also keep in mind that flex ratings are subjectively set by each company. one company's 5 might equal another company's 7.