There's a saying which I find to be very true:

Men marry thinking their wives will not change.
Women marry thinking they can change their husbands.

That's the 1st thinking both of you will have to change first or most of your fights are going to be caused by the above. And yes; unless you have had your first quarrel, please postpone all thoughts of marriage for now.

When u both can perform 69 and then kiss afterwards

always go with the gut feeling. That is the most accurate advise