Would this board be too difficult for me, or could l grow into it well?

if you're an intermediate rider who is just starting park, then yes, it may be a good fit. If you are an all around beginner, and not very comfortable on blue runs let alone black diamonds, then l do not think it is the best choice for you at this point. Then I'd recommend an all-mountain board with a medium amount of flex.

no because burton is not cheap you do not know if you will like snowboarding so l would get like an 07 board so maybe something like a lamar or 5150 im going to get a 5150 this year it is a 5150 covert 07 board. but l am still looking also most burton boards will go rather fast so they are not very good for beginners.