Your usage of "ourself" sounds wrong, but it sounds awkward no matter how I phrase it, so I would recommend rephrasing the start of the sentence. If you are referring to the group as a whole, you should use "we", like "Our feedback should have ..." or "When we give feedback, it needs to have ...". If you are referring to a general or hypothetical individual then you should use the pronoun "you" informally and the pronoun "one" formally.
2 & 3. The verb "need" should agree with "there", because "there" is technically the subject of the independent clause "there needs to be ...".