In GoldenAge, the primary way (only way) to level is through doing your quests every day. There are multiple types of quests, and some are harder to complete than others. To level your sire, you want to make sure you complete your Alliance and Daily Quests every day. You can only complete Alliance Quests when you are in an alliance. Other quests (Instancecs, Hero Quests, and some Bonus Quests) will only level your Hero. Your hero will most likely level much more than you do, but luckily, your hero is the one doing all of the fighting!