Hi Annemarie,
It is not clear what you mean by "self assessment". If your "document" only requires respondents to tick choices, enter comments, etc. without any notion of "correct/incorrect" and without any immediate feedback on correctness/incorrectness, then your "document" falls into the category of "opinion survey".
The Quiz activity is not suited to this purpose. The Survey activity (@Derek) is not suited because it is not customizable. You are left with a choice of the Feedback activity, which is part of Moodle core activities (but may need to be enabled on your moodle site by your admin) or, as advised by Mary, the Questionnaire activity (which is an add-on and needs to be installed by your admin).
If you attached an extract of your "document", containing at least one example of each type of "question", it would help us tremendously to help you out. Please keep in mind that the more vague you are the less chance you get of being helped, the more precise you are and the more concrete examples you provide the more chance you give us to help you.
Joseph