Like i have an xbox live just xbox live and i want to know how to get minecraft on it?

You need to search the store for minecraft. You will need microsoft points to buy the game first before downloading. To get microsoft points you can use your credit card and purchase online or go to a store like gamestop and buy a prepaid card.

If it's a xbox one it doesn't come out until march 30th

You will need to go to the Xbox store, and Find Minecraft. Once you have found it, You will need to add money to your account to pay for it. If you are under 18 years old, ask your Parents.