2 years back i was introduced to inner engineering by my best friend. 
It’s like a set of 7 videos about nature of human being by Sadhguru g and then in part 2 they introduce us to shambhavi mahamudra kriya. 
When he told me to do i ignored him but one day out of nowhere i enrolled for inner engineering. 
I used to do smoking, vaping and eating non veg almost 3 times a day but after completion of my first part of program i automatically stopped smoking and eating non veg. 
I started eating veggies and completely stopped smoking and eating no veg food. 
I used to spend alot of time with my friends and suddenly i started sitting by myself, i started avoiding unusual meet ups, hanging out and i started exploring different forms of meditation. 

::: will tell more about what happened when i started isha kriya and shambhavi. 

But if you are looking for a head start in meditation. You can explore chants and meditation by sadhguru g or you can also start with an app called Headspace.