I am glad to hear that you are thinking about participating in the Humboldt Airsoft League. We are always happy to find new folks that enjoy playing airsoft as much as we do. As for the charter... what are your particular concerns? It's been a while since I read the entire charter, but for the most part I believe it holds true.
Gear requirements as for eye protection are not negotiable, HOWEVER, uniforms and radios are not required from the get-go. I will say this, after my first game in street clothes I realized immediately why BDUs are listed as equipment in the charter. Not only are you very visible without camouflage colors, it also hurts a lot more when you get struck by BBs. I would highly recommend getting some kind of camouflage BDU if you are thinking about getting into airsoft play.
Radios are in no way required but are especially useful if you are new to our fields. You will probably think about buying radios without any prompting once you see the benefit of them on the field.
When you mention "payment" I am not sure what you are referring to. There is currently NO cost to play with the Humboldt Airsoft League and NO dues are collected for membership. You are only responsible for your own gear and ammunition. Biodegradable BBs are required, but are sold on the field in case someone has a need.
If you will be coming to a game for the first time just to try it out, and do not have eye safety, let us know ahead of time. Myself and some other members usually have extra masks that can be lent to you for the day. Also, if you do not have an airsoft gun, Rootbeer has a rental service where he can rent you one of his airsoft guns for the day. Read his thread here for more details:
http://www.humboldtairsoft.com/forums/index.php?topic=1088.0I hope I was able to address some of your concerns, but if you have any other particular concerns, please post a reply. Myself or another member will be happy to answer any questions you might have.