[benneh]

1) yes

2) buy the book

3) harrington on hold em volume 2

to better answer 2, he talks about how you should be pushing or folding with M < 5. cant play tight since you need to gamble and get a stack. M > 20 is essentially the only way you can play tight.

im not good at describing these kings of things... another 2+2er will do a better job. but buy the book and read it, cause harrington explains best.