Life isn't normal, normal is a word people use to not think of them as special or unique. Anyways, a lot of people (including me) like to think magic doesn't really have a color, it's more up to the intent of the practitioner, but that is up to you. Reality is hard to defictionized, especially, when a lot of people's minds are being filled with Hollywood fiction. Many people say, if it's to good to be true, then it probably is. You should always "dig deeper" to gain more knowledge, but never assume you know it all, because no one will ever know everything about this Universe.
To join a coven, you first need to decided, what you want to learn, you need, to read through each coven's biography, which is located on their pages. Then fill out the necessary forms, and send them in, along with going up to the "Accepting Applications" link and click it, then you should know what to do from there. Then you wait for the Priest/ess to get back to you. Sometimes, covens require a voting process.
Sense you are new to this site, you should read the Basics, the Basics are a bunch of information that you can practice and get better at, which will help you understand the concept of magic and how to use it. If you want a more realiable and trusted source of information on the basics here are a couple forum names that you can pursue;
The Basics: Expanded (By: AwakeTooLong, Located on: General Info)
Starting Out (By: Starrie Located on:General Info)
Please note there is a lot more information on the basics residing on the "Articles" section of the site.