How much approx.will this cost??? and how long will it take to get it tattooed?? ?

This is some really good artwork. If I were you, I'd go for an apprenticeship. You don't have to worry about getting it put on you, or how much it'll cost. Get a portfolio of this stuff together ready to show when you turn eighteen. Knock on some doors and make that money! The first would take about two sittings, around $360. The second would have to be reversed from the negative image, and would be in the seven-eight hundred dollar range. How fast would depend on the artist, and how well you can take the pain. Good luck to you!