First of all, I start by making the stick-figure getting pushed down by the force of the bullets (unrealistic, yes). I'm sure you know how this is done, but I do it by putting my stick-figure in a new graphic symbol (CTRL+F8). When inside the symbol itself, just draw a stick getting shot down.
Place the symbol on the main stage. It could look something like this
If you want to add the shading effect that you can see on some of my stick-figures, add a new layer. Copy the symbol from your other layer (CTRL+C) and then put it in the other layer by pasting it to the same spot (CTRL+SHIFT+V). Tint the new symbol to a color you want and move it a bit to a direction by using the arrow tools on your keyboard. Make sure the new layer is under the first layer.
Now lets create the first blood. I make a new symbol again and does some frames of blood squirting. I use the brush tool and use a pretty dark-red color. It's big and fast in the beginning and in the end the drips move slower and gets smaller. Shade some of the blood by drawing lines with the pencil tool and then fill the areas with darker red.
To add a shine just pick a very bright red color and draw some bright stuff next to the drops using the brush tool.
Go back to the main stage and add the symbol in a new layer at the point the stickfigure gets hit. This symbol was supposed to be the blood that comes out on the backside of the stick, so I flip the symbol and put it at his back.
To add the bloodsplatter caused by the bullets, I once again create a new symbol. This time I make it look kind of like an explosion. Use the same shading and shine technique as in the previous blood symbol to create this one. Watch mine frame by frame here
