Re: Should I get in better shape before starting?
You don't have to be in any kind of shape to start training. That is true, but it also doesn't hurt either. I attended summer camp this past year for the 1st time. One thing became apparent to me. Training two days a week isn't enough exercise for me. For the first time since I began practicing Aikido I decided to get in shape. I feel great and it has benefited my intensity level during practicing hand over fist.
Everyone has a different approach when it comes to fitness and aikido. Find what works for you. Regardless, you're body will benefit from the practice alone.
Good luck on your venture.