There's a lot to your question. First off, the term "fair price" is up for interpretation.
There's a lot of work involved. The best thing I can recommend is joining as a member here. Twelve bucks for a year and well worth it.
This will allow you to post in the For Sale section. Take lots of good clear pictures, from the drive side of the bike with good close ups of frame and components.
Then, figure out if they do sell what you will do about shipping them, if you're willing to. It's a lot of work. Buyer pays for it of course but that can be a deal breaker on either side. Sometimes a good bike shop in your area is qualified to disassemble , properly pack and maybe ship it for you.
Like I say, it's a lot of work. You can always put them on the big auction site, but you need to do a lot of legwork there too. And it will cost you 12 to 14% of the final sale. Great pics make a big difference. On a bike like a Team Champion it may just be worth it to you.
But it's all going to depend on condition, how well you portray that condition, in detail, to prospective buyers, and how much you ask for the bikes.
Good luck.