Re: kendo, Iaido and aikido
While many aikido dojos do some 'swordwork' none require kendo training. If you've learned the kendo no kata however, this will make picking up aiki-ken a relative breeze. For equipment, you'll most likely need to get a judo-gi, most places have people train without hakama until shodan. As for getting the basics and doing aikido, you will be able to participate in every aspect of aikido class much faster than you do in kendo. There isn't the same hanging out in the back of the room doing suburi like you see in kendo. In a couple months, you'll be in the thick of things with everyone else.