Personally speaking, I wouldn't deal with eBay to sell your stuff. The percentage they get just isn't worth the trouble to me, and I used them for a few years to dump old inventory from my shop. Even for checking current prices, eBay can have so much variation that it can be confusing.
A better choice would be to post your stuff on the classified boards of fishing sites like this one right here! You usually get a better price for good gear from actual fishermen. People on eBay are all looking for a deal and the lowest they can get away with paying.
I use UPS exclusively for shipping stuff and have found them most reliable. The suggestion about using PVC pipe for shipping tubes is a good one and you really don't need anything more than schedule 20 pipe for most of them. I also rarely use end caps. Crumpled news paper or bubble wrap and duct tape is cheaper and works just fine. Keep in mind that anything over 8' in length is considered "oversized" and will be subject to an extra charge.
If you would like to have a good idea of what your stuff is worth, you may feel free to send me a list of your items via PM and I'll be happy to help you with that so you get the most you can out of what you're selling off.
AND THANK YOU FOR YOUR SERVICE!!!