here's a relatively standard winter spice mix;
1/2 tsp Cinnamon (ground, dry)
1/2 tsp grated fresh Ginger
1/8 tsp Nutmeg (ground, dry)
1/8 tsp Allspice (ground, dry)
dry spices are quite easy because they'll just sink with the rest of the junk.
with your method, you'll want to boil up about 1/2 litre of water, add cinnamon sticks (I'd suggest overdoing it, probably boil like 4) for a good 20 minutes and then stir it in bit by bit at the secondary stage (bottling bucket works well) until it's at the level you want. cinnamon will very easily overpower your beer so go easy on it and have something to clean your palette inbetween tastings!