We all know that the outside to in swing causes the slice, but correcting it is so much easier said than done.The tips which I have given, but in turn acquired from far better golfers than myself, are intended to cure a very common problem amongst inexperienced golfers. The internet/youtube is full of professional golfers giving advice on the subject, but most of it is so damn technical, the average beginner wouldn't have a clue what to do.
I would not use #1, #3, or #5. A lot slicers try to compensate by closing the club face which only exasperates the problem as they usually also swing across the target line from the outside. To create a draw, one should aim club face a little to the right, and swing path further to the right (create differential). The stance line could help some, but it is possible to draw from open, closed, or straight stance. "Low and Slow" is also not recommended as is the old "keep your head down". Choking down "slightly" is good though or simply use your 3W or hybrid in lieu of the driver.
My anti slice practice is of a visual type. What I have done is focused on making my hands bring the club head from the inside to out. Yes, the club head is moving pretty fast, but I still see the "blurr" of what the club head is doing, and what it's path is into the ball.