Hi joeisi!
I might not answer every question if I feel like I don't have enough knowledge about the subject but here are some of my thoughts about your questions.
Your plan was to play microstakes so play tight and don't bluff. If you do bluff, pick someone who seems to know something about the game and make sure that your table image is tight before you do that. Don't ever bluff a fish cause then you will only lose your money. TAG is the best way to go. Be patient and have fun while crushing the stakes by doing so
Always the maximum so 100bb for sure. You want to win the maximum when you have a chance so that's why you should keep your stack always full. Short-stack is a sign of weakness so don't do that and pay attention to those who do. They are probably not the best players.
Basically anything above 0 is good. You have to remember though that you can't win every session so that's why you shouldn't be thinking too much about win rates one session at a time. It's the long run that matters. Here's a good article about win rates:
http://www.microgrinder.com/poker-strategy-articles/introduction-to-win-rates/
That depends highly on the player itself. Everything is good as long as you can stick to your A-game even after bad beats and don't tilt. However, sometimes you might be just running bad and then I would much rather just take a break even when I'm not tilting. Max one rebuy sounds reasonable to me, that's what I usually do myself too. Sometimes I just quit already when I have lost one buy-in and try again later.
Some people do, most of us don't. My personal answer is no but someone might disagree and then I would also like to hear why so. I have never really understood the point of running twice. Of course it can save you from a bad beat but then again it also might prevent you from winning the whole pot when you are the favourite.
Yes. You want to win the maximum when you have a chance to do that so that's why you should always keep your stack full. It makes sense if you really think about it: let's say you buy-in for 5 dollars. Then you lose 3 so without auto-top up your stack is now 2. Then in the next hand you get Aces and double up. You still have only 4 after that so you are still 1 dollar short. Now let's think about this with auto top-up: You have 5 and lose 3. After auto top-up your stack refills to 5 again. Right now you have lost that same 3 dollars but now when you double up, you win 5 because your stack is full and now you have actually made 2 dollars more instead of being one dollar short.
In 6 max you can basically play much looser on early position as well so that's why I open almost the same cards as I do in the late position. Some people might strongly disagree with me in this one. I know that the common rule is to tighten up in the early position but I have made my own rules for 6 max and that has been working well for me.
Another subject where people might disagree with me but in 6 max microstakes cash game, I don't really see the point of defending the blinds. If I have nothing good, I don't play.
Aaaand another where I might have a different kind of approach than others but at the microstakes, I 3bet really tight. That means that I only 3bet with AA, KK and AK. Sometimes QQ. Anything below that has caused me nothing but trouble. Most players don't pay attention to your game, they just look at their own cards all the time, so they don't even realize if you have been folding 50 hands in a row and then you are suddenly making a 3bet. They don't even think about a chance of you having AA at that time.
This is the only question that I don't have any answer since I don't use HUD myself. That's something that is still missing in my game and I too would like to hear answers to this question from someone else since I am really thinking about getting HUD.
I hope that my answers were at least little helpful to you
Good luck!