On concern for a lot of people is whether or not they are correctly distributing their stat points in the proper area for what they wish to do.
Putting stat points in the wrong stat and later finding out you want to swap it over to somewhere else is a timely endeavor. There is only one way to currently do it. I will discuss this at the bottom.
Your primary stats are Stamina, Attack, and Defense. As a beginner I always recommend putting all your points into Stamina until you get to 80-100 depending on preference. I say this because it will allow you to level more quickly which will open up the ability to add more fellows. Each fellow added gives you a bonus five stat points. Another advantage of having higher stamina is you feel the need to play less often. Every minute that goes by while you are capped in stamina is a minute of lost value. Because of that I think that most people check their accounts every hour and a half or so. If you push to 120 stamina you only need to check your account every two hours to quest. I consider 80-120 Stamina the minimum range of what somebody should have. Any less than that you will regret it during events that involve heavy questing. Recently the Easter Quests as well as The Roar of the Dragons. Stamina points are replenished to full by clear water.
After you have allocated Stamina I will always recommend get at least 130-150 points in attack and in defense. The reason I say these numbers is that they are the minimums necessary to hold the highest point attack cards in a five set. This will ensure you can make either one good attack or one good defend. This also comes in valuable during events that utilize attack and defense points, most recently the Holy War. Both attack and defense is refreshed using holy powder.
As for where you go from here. If you followed my advice you should be around 100 Stamina, 130 Attack, 130 Defense and wondering where to go from here. This is entirely dependent on you. Most Orders are looking for people who can maintain themselves during Holy Wars. Because of this I would recommend choosing either attack or defense, and ignore stamina.
I can't truly discuss the importance of Attack/Defense without mentioning Holy Wars. I am hoping that whoever is reading this is aware of what a Holy War is, and what the roles are of people, I will make a post about Holy Wars at some point.
Having heavy attack points gives an attacker the ability to bash an enemy multiple times. During a Holy War this is important because each time you defeat an enemy you'll gain points. This will allow you to increase your individual ranking in a holy war significantly. Having heavy attack points also means when you use a Holy Powder you may be getting 2-3 or more attacks per holy powder than somebody who only has enough attack points to hit once. Many Orders have several solid attackers.
Having heavy defense points hurts your individual ranking in a Holy War because you are unable to accumulate heavy points as an individual because of your low attack power. Because of this there are very few true defense leaders. The advantage to defense points is that no matter the attacker, you only lose 10 pts per failed attack during a Holy War. This means that if you had 300 points and you deck was a 100 point deck, they'd have to attack you 20 times. If you defense deck is strong enough for their attack leaders to not beat it, this will almost ensure a victory for your order and greater points as a group.
Having heavy stamina points is an option. This would give you the ability to accumulate huge amounts of cards through questing and use of cure water. It will also almost ensure that an Order will not take you. Many people have a second device that they use as a feeder account for this purpose. If you have 300 stamina, a cure water is that much more potent. Stamina is not so important that it should ever be at this level.
So decide what you want to do, I personally push attack power because I've always believed that even if you have no defense, if their defense can't stop your offense it doesn't matter. But anybody who knows football knows that a great offense wins games, a great defense wins championships.