Every domainer has a different idea about making money in this industry, so don't take my opinions as best advice.
One of the most important things to understand is website traffic. To learn about this, you really ned to host a name, and try to pick up visitors. For example, MetalRope.com has just dropped, so you can het that for reg fee, and you may even make a few dollars on a sale if you are lucky, but you can research metal ropes, and put info onto a site, and then watch the stats to see how you can build traffic. Google analytics can help with the reports.
There are probably better names by the way, - FarmDeliveries.com for example.