if you are wanting to start a competitive clan that you hope to enter into clan leagues and tournaments you will need the following:-
Webspace, You can create a free site at enjin.com here you can choose a different veriety of site layouts.
Knowledge, you need some website design experience to build your website as it can be a bit tricky for novices although enjin do provide help videos.you also need to know how to run and maintain a busy clan with people joining and leavng on a frequent basis.you
will need to know how to sign up to leagues and tournaments and youll need to know about adspace and where to recruit people for your clan.
i hope i have been some help to you :P
if not jus pm me on live and il give you some more in depth if you need it.
i know it seems a lot to do but if you have help it is a lot easier.
if you would like to join a clan and see how a clan works out you are free to join our clan where we can show you the ropes and help you build your own clan whilst you are with us.