Rob,
I can't help you with what book to get, because it has been years since I've picked up an AutoCad book. But I can tell you that the majority of the books I have gone through won't come out and tell you how to draw in 3d. Autodesk sells LT as their 2d software and that is pretty much the stand of most people that write books on it. But if it is all you have and you don't want to spend money you could be using to build a TearDrop buying more software, I will let you know that it can be done and the book that you have can help if you key on the right features. Stick with wireframe and learn to use Layers, when a drawing gets complicated specially in 3d you have to be able to turn layers on and off to clean things up. Learn and understand the UCS and how to move it around that is invaluable in drawing 3d in LT. Learn the Thickness command that alone will save you tons of time. Learn 3d Cartesian Cordinates, the better you know this the easier it will be. Then once you learn to draw 3d wireframe in LT download the free Google Sketchup program. Import your LT wireframe into it and then shade, surface and texture to your hearts content. You can do fly arounds and walk throughs and pretty much see exactly what your finished TearDrop will look like. The one thing to remember is that LT has limits in 3d the biggest being spheres, but then how many times have you tried wrapping a sheet of plywood around a sphere, but it does the stick and sheet goods that we home builders use, just fine.
Below is a design I am working on using LT and SketchUP you of course can't see it but every board, tube, sheet of plywood is actually in there just as if i built it in the computer.
All that to tell you that LT can be a great design tool if you have patience and go about it the right way.
Hope this helps,
Peter