Newbie.......

[3TJ]

My first post........please go gentle with me!!
I have been playing on line since January and love the game - after losing around $500 up till april I then returned from my honeymoon and have built a $70 bank roll upto over $1000, i play on VC poker on 0.5/$1 NL hold em but Im sure I am wining more on luck than skill. I also play 2 tables at once with them overlapped quite alot so they just ping up when its mt turn. I have loads of questions but to start...
Whats the best reading material for me to improve?
How do I play 4 tables, Should I just play the AA, KK, AK, AQ and pairs? what screen size do i need?
I dont use any software for odds etc shuld I use one? what is poker tracker that I have seen mentioned?
many more questions but thought Id start somewhere...
Please can anyone guide me in the right direction....
Thanks
3TJ