Bgc, if you aren't confident in your graph-reading abilities, don't be afraid to try drop-shotting "blind" as it will help you get started with this tactic. I catch a lot of fish out of boat slips by pitching my bait into them without actually going into the slip. Of course, when you are fishing more horizontal like this, your bait needs to be on the bottom.
For vertical fishing, I would suggest going to an area where you know fish live, such as a favorite bluff end. Get right over the ledge where the bluff end drops from say 18 feet to much deeper water and drop your rig to the bottom. The presence of trees is a bonus.
Bluff end fish normally stay pretty close to the drop. Keep working this tactic out to 50-60 feet of water, but realize that once you reach about 30 feet, there will likely be a thermocline and you should start to see fish suspended right around that depth, so you'll need to bring your bait up from the bottom to the depth at which you are seeing the fish. They aren't likely to be below the thermocline because there's not enough oxygen.
Hope this helps get you started.