Instagram page sizing

Brand new to Swift ... 78 years old and slow ... please bear with me.
Two things,

1 I have a page which displays on my website fine, but it doesn't work well on Instagram. So, can I resize the page I have already made to fit Instagram, and what size would that be?

2 Can I set up an Instagram page from scratch before I start designing? I see there are preset FaceBook pages, but no Instagram. Perhaps they are the same??

Thanks for your patience.

Are you sure this is related to Swift? Are you using Swift on Server?