If you can afford a few more UNOs and the MCP2515 modules great. But first get both of your modules to send and receive. Then do what I call a keep alive and have each one transmit its identity every so often. By adding others you can use one to keep track of the traffic. Then do some code where one sends blink commands just a few blinks different for each to different modules. Then use your monitor one to blink x times for each keep alive it receives. From there you are on the way. Here is a buss sketch,note where the termination resistors are on the physical end of the bus. You only put jumpers at each end, no more. If you power down and measure the bus it should be about 60 ohms.
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