The first problem is either a broken trigger or the half cock and safety notches on the hammer are worn or broken. That is often the result of too light a pull so the finger does not have to pull hard enough for the trigger to clear the notches.
The bolt might be a separate issue or the hammer could be worn in that area also. It sounds like the gun needs an overhaul; if you choose to do it yourself and have little experience, I suggest you buy Kuhnhausen's book on the Single Action.
Jim
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