I don't think you can forward as attachment. I don't remember ever seeing any option of that kind.
You can, however, forward multiple mails when you create a new memo. You do that simply by selecting all the mails you want to forward before hand, then click on Forward and it's done.
Since you are new to Notes, I would suggest that you forget any other mail clients you were used to using. Notes is different from most in many ways. You can use the F1 key to call up the User Help and read a bit about your mailbox and how it works.
Does this help ?
Pascal.