I appreciate all the input, and I love the examples, it makes it much easier to visualize. It probably sounds silly, but I am trying to sketch out my ideas so I can see it better before I start building. I really like the map I'm on, so I just made a backup in case I mess up. That way, no worries about if I want to start over at embark. This last year I just started embarking without the anvil so I can spend the points on other things, since I found that I have never gotten my metal industry started before I get caravans anyway. So I believe I have plenty of war dogs to start, and I think my "ranger" has animal training or whatever, so I can train the dogs who are not wardogs.
I have a neat map, it has a magma pipe, so once I figure out how those work with workshops and whatnot, I can utilize it. There is a great deal of elevation difference on the bottom end of the map, creating a waterfall across a bunch of levels on the cliff-face. The embark level with the river is flat, and I think I plan on building on the level just below that one. Since I'm told that you can avoid flooding by running channels and whatnot back into the river, I'm looking forward to creating some waterfalls inside my fortress, and hopefully a cistern, which I still haven't figured out yet. THAT is going to require some heavy experimentation, or as the community here likes to say, "fun." The flat embark surface near the river I think will provide me with some great outdoor walled-in farming area, which I could probably surround completely with a moat for defense, since it wouldn't need access to the surrounding area to be effective.
I thought maybe if I was going with the "L" shaped approach to my entrance, another "line" of defense might be to build some kind of removable floor (Would a drawbridge be best for this or is there a type of retractile floor? A lifting bridge might be better since it would provide a "wall," when up, right?) either AT the juncture of the "L," or farther in probably before the trade depo. Before that might even be better, to avoid them shooting in, unless I used a drawbridge, right?
So, more questions for you awesome people who indulge me:
How high/low can archers/dwarves shoot across Z-Levels?
What exactly are fortifications, what do they do and how do you make them most effective?
How do you make/set floors in crafted buildings, such as towers?
How wide should a tower/wall be to be the most effective. Is 3x3 ok if I'm just using it for an arrow tower?
What causes an enemy to path a certain way? For example, if I closed up my fort, but provided "trapped" areas that were still open, would there be a way to get them to go into them?
I keep hearing about "assigning" dwarves to a certain area. How do you do this?
I thought I had more questions, later I guess. Thanks for the ideas, I think I'm going to get started!