1. Get the 2D tutorial. It will be necessary for learning how to select and move objects, adjusting the Reference Points and snapping them to specific locations. When I first got TurboCAD, I had no idea how to place objects, but once it was explained to me, I got along with it just fine.
2. Object Import is common. The location of the command varies with almost each version of the software (I never understood that, but TurboCAD has a very flexible user interface, so you can adjust it as you want). McMaster-Carr has 3D CAD files for most of the stuff they sell. Use the STEP format for the best results (there is more than one, I just go with the highest-numbered version).
3. You can import information into Tables for adding a BOM to your document. No personal experience with that command. If you don't need any special formatting, you can also import into a Multi-Text Object.
TC Pro Platinum 2017, 2016 & 2015 (all with LightWorks) & V21
System: i7-5820K @ 3.30GHz, ASRock X99 Extreme4, 16GB DDR4-2133 RAM, Gigabyte GTX 970, Samsung NVMe SSD 950 (256GB), Windows 7 Pro (64-bit) SP1