Hello Venks! Welcome to the Genesis League. Please start by registering your team on this forum. All you have to do is post what Pokemon you will be using to challenge the league. If you'd like to include more than 6 so you can rotate, then by all means, it is encouraged.
Once that is done, you will find links to the Gym Leader's gyms on the first page of this forum. Just click on one of them and PM them saying you want a gym battle. You can challenge the gyms in any order. If a leader is ready, they will tell you the rules of the gym. Some have already posted their rules on the forum but if you can't find it, then just asked them.
I believe that is the basics. Good luck on your quest to become the League Champion!
Do you have anything to add thebest?