As others have said if a local high school/college/welding supply has classes available take them ! They will start at the basic level and work from there , you might ask an instructor if it would be ok to bring your machine into at least one class to learn the basic setup . Welding is a skill set that you have to practice a lot to get good at . And safety can NOT be ignored , you need good gloves and a great helmet preferably an auto darkening remember you only have one set of eyes !
Find a local weld shop supplier and get to be friends with them , you are going to need the gas mix and they will have it along with any thing else you will need . It may be a little more $$$ than buying off the internet but establishing that relationship has value . Most of the guys/gals there will know what they are doing . In the beginning it may be frustrating to learn how to weld , don't get discouraged just keep at it . Once you get the hang of it welding is a lot of fun............. it is a manly skill set