1. Don't bombard with questions
Of course you will want to learn some things about him/her but when you have no clear response for your question, don't insist. You're not the police and he/she is not a criminal.
2. Don't act like you are having a date with your phone
If it is possible, mute your phone.
3. Don't act like a friend
Make the person feel special.
4. Don't praise yourself a lot
Don't make it sound like "I am perfect".
5. Don't talk about your past relationships
Don't talk about your past relationships as if you are talking with your friend. If you do, you will have nothing but a new friend.
6. Don't lie
Even it's a small one, it can lead to trouble in the future.
7. Don't be pushy at the end of the night
You can invite him/her home but when the person rejects the idea, don't insist.