Mingo has a great tool to simplify creating indexes. This interactive tool uses a comprehensive UI to add/remove fields and specify options in a simple way. The resulting command is immediately shown. This also works backwards: you may edit the command and the UI updates itself.
Mingo knows all the options indexes have and the attributes they take. For example, adding “collation” will pre-fill all the attributes available, then alter them as you need.
To add keys, Mingo lets you choose from all available fields in your documents.