The magazines like Family Handyman and Wood and American Woodworker are pretty darned good, but there are some real important things to consider. One real point is the quality and price of your tools. A 12" miter saw and the shave tool to get the length and angles exactly right are not cheap. One good thing is that you say you want to do both crown and picture framing and the same rules and tools apply to both.
Another thing is that you have a lot to practice on. Start with the rooms where the crown will be painted and a little filler will not hurt or show up. Your first one will probably be great. It's the second room that will cause you problems because you think you know what you are doing. Plus, you start to see more flaws and your standards get better. Don't forget that with a router and table saw, you can turn a bad piece of crown molding into great picture framing with a little thought and planning. Again, check the old magazines for tips and Norm had a New Yankee Workshop show on this.
There are some good tips and website references on this board, if you do a search. Hit ctrl-f and type "crown" in the block then follow the directions. With the way this board loads, this will drive you crazy, but stick to it.
To do everything you want, you will be looking at about $2k for tools, dust collection, mat cutting, etc., but you don't have to buy it all at the same time. Start with the crown and save your scrap for framing later.