Hi Karen

Been awhile since I took Lisa's Fundamentals but I think she uses both. It's important for those new to guitar to understand that it's not easy and in my opinion, because of this, starting out with an instrument that is easier to play has benefits. Electric guitar is much easier to play than an acoustic for several reasons, but to be direct, acoustic guitars take far more pressure and hand strength to play. And I should also point out that in terms of music there are only 12 notes. Doesn't matter what you play, you still have 12 notes to work with.

I have not taken Anders course, but it looks very exciting and he is an excellent teacher as is Lisa.

Time, difficult to say. The more time you practice the better you will become. I would say to stay away from time frames and adopt a stance that guitar is now a part of your life and make it a regular part.

Yes on the 4th. Btw when you stand the neck is angled up but it is not a classical posture. But when Lisa teaches she is standing with the guitar slung in what most would consider "normal" position.