Regular word sentence then question at the end, how do you do it?

They're okay Code but in the first two don't cap "You", while the comma can go

The third one also has a comma before you.
I like the second choice
Without the comma, of course

"Of course, you..." The hyphen is OK. It's a matter of preference for the author. It shows a dramatic pause.



"Of course, you..." This is not OK. There are only a few ways to use a semicolon ( correctly, and this isn't one of them.



"Of course, you can..." This is also correct. The full stop (period) also shows a slight pause. It's less dramatic/emphatic than using the hyphen, I think.

Don't forget that we don't capitalize the first word after a transition.

I was born in New Jersey, so I could be completely ignorant of such things. .

But I have labored for years in the belief that a semicolon could be used between independent clauses; it can, in fact, be used wherever a period could be used. I prefer using in cases where a second sentence is in explanation of (or, somewhat less important than) a first.

Yeah, you're right; it's just that I've never seen it used to introduce an interrogative. Seems to me that it's usually used to show a dramatic cause-and-effect or surprising contrast relationship. I won't say that it's wrong; I'll just say that it's not standard or borderline acceptable.

But then again, I'm not particularly fond of prescriptive grammar; descriptive grammar suits most of my students' needs better.

It's best to keep Strunk and White handy.
Then do whatever the heck you please.

That last bit works only if you're a reasonably well-educated native speaker.

I suppose how one chooses to write depends on such things as intended audience, voice, point of view, etc.

I agree with you and neologist. Don't make mistakes out of ignorance. Do it for specific effect.

Yeah, that's what I was trying to say. Learn the rules, then learn how to break them skillfully.