Source: MMOWTS
Retribution Paladin is absolutely one of the most popular specs among the starters, this surely one of the least mechanically demanding specs in game, if you're a starter in PVP and PVE doing some casual leveling in battlegrounds, paladin may be the perfect class for you.
There are just few offensive abilities, like judgment, crusader strike or divine storm of Retribution paladin. The Art of War talent is something retribution paladin rely on a lot, because it gives you instant Flash of Light. More importantly your auto attacks could possible reset the cool down of Blade of Justice, meanwhile the damage of Blade of Wrath could also increase 25%, which is absolutely crazy skills.
Some defensive spells may look a little bit confusing when you see all of them at the first time. The thing is you can use just one of them at the time, and all other defensive abilities become unable to use for some period of time. Thus, the point is you have to consider which one single defensive spell do you need to use in current moment.
When we talk about defensive spells, we have to talk about the Divine Shield, a powerful skill which could make you immune to everything. Next to Divine Shield we have a Lay on Hands with 15 minutes cool down which heals you for amount of your maximum health. Only paladin has such two defensive spells in entire game, and that will help you a lot in world PVP facing different enemies in the open world and make you very hard to beat in one versus one fights, especially on lower skill. Anyway don't get too excited, because on average to higher skill, you have a lot of problems facing casters and always remember that before picking this class. But when we talk about the simplicity and easy to start, Retribution Paladin is possibly one of the most independent specs in game.
However, when it comes to arena, paladin has its own role in arenas which is mainly supportive DPS role, you need macro for each healing or defensive spell. If this somehow looks a little bit hard for you in arenas, you can simply play the version of the picture I post below, and this is surely the most brain dead spec you can ever play, but it is really interesting for beginners.
In arena, gears also play important roles for you characters as well, but how can we buy the powerful gears? Gold is necessary as a main currency in WOTLK Classic, in MMOWTS you can buy WOTLK Classic Gold in reasonable price. Do not wait, come to buy!