Using for Traditional humanities methods Collections

Hi we have as we view, two sets of collections we want to import into Omeka. We have already setup Omeka and started to play with it. But finding it a difficult to understand with the default Dublin Core attributes and what what we want.
Hope I can get answer for this:

Can I have a collection created in Omeka Dublin Core, and then have an item_type by which my collection is categorized, further down, for each item_type can I have multiple items, which I can publish online. And for each items can I define my own attributes, if yes how can i define my own attributes.

Please help.

close this topic, this is redundant and I am being answered on another thread. thank you!