Here's a good place to find a starter package if you've never worked in media before:
http://www.bswusa.com/Podcasting-Packages--C379.aspxI applaud you for your efforts, it will be tough - and growth will be very slow without a major network backing you, but it can and will work as long as you do everything regularly and make sure you have a backup plan if guests don't call, etc. Your listeners will expect your show even if you're sick or out of town with the family.
Finally, use your resources! Several of our teams have bloggers or podcasters that I'm sure would like to help/partner with you.
From this radio guy, make sure you have fun! Good luck, I'm looking forward to it.