The requirements to join Sins are reasonable, nonetheless, one is not to think that they lack a certain degree of efficiency, or informality. They do not. The requirements are as listed below:
A minimum play of 500 hours. This is just a little over 20 days of play, accumulated. If you've created a char in march and apply to join in april, and have only played a few times since, do not expect to be added into the clan. If you lack the knowledge and experience as listed above you should be more focused on that than on which clan you're going to join, honestly.
You need to have sufficient information of Sloe and Korden. If you don't know what or where Sloe and Kordan are, you'd best look for another clan to join until you do. Sufficient information consists of knowing which town is where, how to get to it, and a few most common mobs like Pegad, Belcara, Nerdo Irongutt, and the like. Knowledge of the island of Archais is not as required, yet. Saying that, the more you know about the newby islands the better chance you have at being admitted into the clan.
Lastly, and most importantly, a good reputation in the game.
If you're one who's been banned from Gossip at least 20 times already, has had at least 1 spammer flag, is constantly trolling outside, and posts 95% x rated content and 5% personal insults at whom ever tells you to shut up, you might as well leave this page now.
Clan Sins Of Salem has a blacklist of players whom will never make it into the clan based on their horrible reputation over the months and years that they've been playing.
Don't join that list!