Some hair questions for growing longer, thicker and healthier hair?

There is no trick to longer hair. I use mane and tails extensively and while for a cheap shampoo it works very nicely, it is by no means some magic solution that makes your hair amazing. We're all born with hair a certain way and there really is not much you can do to change that. Start taking a daily multi-vitamin and make sure you eat healthy. But aside from that, there is no way to insure hair growth. There are however many haircuts you can get that provide the illusion of thick hair and many products and ways of styling that give the illusion of thick hair. The only trick to healthy hair is a healthy diet, not using dyes, and staying away from heat styling. I also wouldn't buy fish oil pills simply because fish is full of mercury (and isn't very sustainable) and there are many other forms of obtaining omega-3 (and it can be done cheaply and without further decimating the already dangerously low fish stocks).