Hi Lindsey,
Thanks for contacting us though I am sorry to hear you are experiencing difficulties.
As a first step, can you login to your (new) site and visit the Settings → Permalinks screen: you don’t need to change anything, though, as just visiting this screen causes WordPress to ‘refresh’ its list of rewrite rules which are used to ensure the correct pages can be found and loaded.
Can you try that and see if that resolves things?