There are not many customs that are unique to the dojo or Aikido. The rest will follow if you respect your partner, the dojo place, and objects.
No one in the dojo will scold you for disobeying some custom you were unaware of. Someone who notices should gently let you know.
We have also posted all of the common customs within the dojo in “About Shishin-Kai” (see: Dojo rules)