mixing insulins

howdy people, i need a little help. Here r the basics> 25 yr old, female, was diagnosed 1 week from 16 bday, Type 1 diabetes, when i follow strict diet plan still get real high highs, when i don't follow diet still get highs, when i don't eat i still get highs. No insurance since Bush, right now following old sliding scale last Dr. gave me. My sugars r fine sometimes not all the time, i try my best nothing i do works. but i know how much r insulin to give myself. Someone i know gave me some insulin that they came across, Lantus, Novolog mix 70/30, and novolin R. I am taking now lantus 25 units at night, and the last bottle of novolog regular i have been using the sliding scale last DR. gave. I wanted to know how to use the Novolog mix? and do i need regular insulin while take the Novolog mix? and should i stop taking the lantus if i start the novolog mix?   Any help is welcomed, please and thank you.