Talking to my dad about puberty?

Well do you not think that he was a Boy once and had once had the same dilemma you have now?

why don't you ask and learn online? That way you remain in a good relation with your father and get the answers you need. Common things about it,

-If you reached puberty you are now a man.

-masturbation is haraam

-sex without marriage is haraam.

-you must not be alone with a woman older than or in puberty.

any more questions feel free to ask?

peace be upon you, bro,

A

Tell him that you want to know, because the more you know from the right resources, the less likely you'll have to find out about it from friends, who of course can get you into trouble because their lack of maturity and experience to back up what they know. If he knows that you're just asking for information purposes to look at such things in a responsible and adult way, he may be more open.

It's easy to ''approach'' him. Just suggest him to have a shower together, make him drop the soap and pick it up and approach him from behind ;3

What exactly did you need clarified from him? How to masturbate? What the penis is for? Really? You obviously have access to the Internet so look it up yourself.