Here is a step-by-step guide on how to build your own PC:

1. Add the hardware: First, install the processor and power supply on the motherboard, and then put the motherboard in the case.
2. Install the memory: RAM is the most straightforward hardware to install when building a PC.
3. Install the SSD: Installation will differ depending on the form factor of the SSD you've purchased (2.5-inch, mSATA, or M.2).
4. Test the system: Before you install your operating system, you should test your system to make sure everything is working correctly.

For more detailed instructions and visual demonstrations, you can check out this guide from Crucial or this video from YouTube. I hope this helps!