Protecting Iron Coins

The best method of protecting any coin is to keep them from moisture and air. The Oxygen in the air does a lot of damage to any coins regardless of the type of metal. Oxyger reacts with almost everything metal.
1. Place them in what is called a 2x2 flip. That will not guarantee completely air tight conditions but will keep the greatest amount of air and mositure from your coins.
2. If you use Albums for those coins, place them in a Zip Lock Plastic bag. Press out as much air as possible prior to closing.
3. Remember removing some of the rust also removes some of the original metal so stopping the rusting is a first. Then possibly not removing what is there may also be a good idea.
4. If you do want to try something, try coating them in an completely acid free type of oil. After that, then use the 2x2's.
5. Good idea of using the gun bluing on your home made coinage. Many of the Gun Bluing solutions contain metal preservatives which is one of the reasons it was started.
Note on the intructions it usually states to finish your Bluing with an oil rub.

Although this is not iron-specific advice, I prefer Mylar* 2x2s because it's the strongest gas barrier. They're the most common type, but acetate ones are pretty common too.

* Mylar is a brand name for biaxially-oriented polyethylene terephthalate, AKA BoPET and may be sold as such.