Click on the dragon amulet at the bottom of the screen, click quest log at the top-right of the screen, scroll down until you see 'shadow of the wind village', visit it, talk to the ninja, and when you want to become a ninja, he will want you to get a book called 'itchy itchy paradise', which costs 3500 coins in the weapon shop, which is the only place to buy the book. Don't use the class. First just get wind scrolls (random quest rewards) and train the armor fully.
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Go to the Shadow of the Wind Village and enter the weaponshop. Buy the "tactics" book, Itchy Itchy Paradise (sounds like Thyton's got some serious rash or something. >.>) and talk to Thyton. Click become a ninja and click "Give "Tactics" Book". (requires 3500 to buy, by the way). You are now a ninja.
PS: Do not use it just yet! Keep on doing random quests. (or just pick one that's easiest for you and if you get a different one, leave and try again. hint hint). Once you have 14 Wind Scrolls, train the armor until you've used em all. CONGRATS! You now have fully trained Ninja!
In free realms, it's easy to become a ninja, and it's free too! However, you need to make sure you have leveled your brawler a bit first. You can find the ninja trainer a bit south of Lakeshore. Check the small map on the upper right corner until you find a little cluster of a shop and a quest. The person who gives the quest is named Ty. Take the quest and the one after it, where you have to battle a Troll Summoner. You'll then get the ninja job and quest chain!
2 ways to become an official ranger you pick rouge instead of warrior or mage. when you start you get a crossbow. 2cd way is just to get range weapons and do range stuff