There are many schools and associations around the world, that will train you to become a mountain guide, including the American Mountain Guides Association or you could visit the International Federation of Mountain Guides Association at their web site. Many associations on a worldwide basis are members of the Federation. You could even train under an experienced mountain guide.
Whom are you going to work for ?
Independently or if you prefer to be employed, many hotels, institutions and resorts would be willing to hire you.
Is quite excellent and ranges from US$ 100 to 500 per day if you are to be self employed and for those who prefer the security of employment the salary begins at $ 3000 to 4000, plus of course the tips.