Dating a younger girl might seem awkward for you or the girl but making intelligent choices and knowing how to act and do makes it a very successfully. Her are some tips that might help
Try knowing her.
Before you are sure you want to date this girl, you need to know basic facts about her. (eg. her birthday, favorite color, TV shows, music, etc.).
Talk to her relatives.
She’s till young so try asking her brothers, sisters, parents, on their consent. If it’s all right with them, you won’t feel too worried to date this girl.
Try not to rush
Younger girls will feel afraid if you just burst out and ask them to date you (makes them feel as if you’re some sort of creep who preys on young girls). Take some time and get to know her. Then when the time is right, ask her. Don’t say “I love you” too soon, either. It scares her away.
Don’t be in a hurry for the kiss.
Since she is younger, a kiss would feel weird and confusing as she probably hasn’t much experience. If you do kiss her early on, don’t do it every minute.
Keep focused on the goal.
Don’t mess around with other girls if you and this girl already like each other. Her emotions would take time to recover from damage and she wouldn’t like you anymore.
Don’t act too mature
Don’t act too mature and grown-up, or she will feel immature and awkward around you. She might dump you for a guy close to her age. Talk about things girls her age talk about.
Don’t worry about the teasing
Take deep breaths and remind yourself that others’ opinions don’t matter(teasing, name calling). If you really like this girl, others’ opinions mean jack.
If the two of you already knew/ liked each other, it wouldn’t feel as awkward to be dating.
Keep conversation appropriate.
Talking about something like sex would place her in an awkward position. Talk about sports, TV, family. Something casual.
If you feel or she feels she isn’t ready to be with your friends, wait.
It’s easier for her if you get to know her friends first. This will really help her to settle into the situation.