I want to become a vegan. Any tips?

After watching a video about the truth behind meat, dairy, and fish products I have decided to become a vegan. I'm horrified about this and i cant beleive ive lived 14 years of my life, not knowing that the animals ive been eating weren't humanely killed (humane, in my opinion excludes electrocution, suffocation, drowning, slitting throats, and hanging). Anyways, i need some tips on becoming vegan. how do i get all my nutrients?