When you burn your hand the first thing that you should do is rinse the burn with running water This is to stop the skin from further cooking. Next, get some antibiotic ointment, cover it and let it heal. If it’s a big wound, please visit your local doctor to get it checked.
There are many home remedies which can and will only make it worst. Ice water will damage the tissue further. Flour is a bad idea as well, you are trying to remedy a burn wound not bake a cake! There are heaps of other remedies but I recommend you stick to basics to mitigate the damage.