I want to create simple page in orchard that has a list of my contentPart (for example: MyTemplatePart).
"MyTemplatePart" has two fields: Title (simple text) and Text (using html editor)
Attaching multiple of the same parts to a content type is not how orchard works. There can always be a maximum of one unique part per content type.
What you might consider is that your MyTemplate might be a type instead of a part. To create your functionality simply follow these steps: