What should I do if my wound bleeds during prayer? Should I continue my prayer if I wipe the blood with a tissue, or should I repeat it? And should I repeat the prayer if I find impurity on my garment after finishing it?

The correct view is that blood exiting from other than the two private parts (front and back) does not nullify ablution. If blood exits from a worshipper while praying, and it is a small amount, he should wipe it off and complete his prayer. If it is a large amount, he should leave to wash it and bandage it, then return and recommence his prayer. Whoever is afflicted with a wound that does not stop bleeding should pray even if the blood is flowing. As for one who prays with impurity on his garment or body, knowing about it, his prayer is invalid. But if he was unaware of it or forgot it, his prayer is valid.