I know of three methods you can use to smelt these:
1. Put everything in a campfire, add fuel and wait.
2. Heat everything up, then take everything out and add it in one by one to prevent it from resetting its heat when one item is smelted.
3. Use a bloomery.
In my opinion, bloomerys require the least effort and fuel, but you will loose about 3 bricks, which I think is not too bad as with the cost of 6 charcoal and 24 flint you will still have a profit of 45 bricks. I would like to hear your opinion on what the best option is.