help please...

Okay so I have got a chance to really experience with Henna and i think i fell in love with this medium...
I have got two cones from a friend and now Im covered
I really want to try and make paste, and get everything ready so I can start incorporate Henna into my business, but I am so overwhelmed with the information out there! (hennapages, hennalounge, etc.)
I would like to know where can i cut expenses, does it worth it to buy a roll of Myler and cut and roll my own cones, or buy the pre cut ones?
which Henna is the most commonly used?
any other tips will be appreciated!
Im attaching a picture of my first attempt, I was happy with the results and think I can turn this joyful form of art into money

Most of your questions are about artist preference. Buying a roll and cutting cones yourself is generally going to cost you a lot less especially if you get a good deal on Mylar. That and you can control the thickness and your size and shape preferences. If however someone has the thickness and size you want precut it can save you a ton of time and frustration.

I am pretty sure Jamila is the most commonly used henna powder followed by Rajasthani or a combination of the two. Though right now there is a crack down on henna being imported and used on skin so be patient with your suppliers.

The most important thing you want to be sure of is that you have a good consistently reliable mix that stains dark. Looks like you have the basic skills for it already so with a little practice should have several designs down just fine.