I used a silver Sharpie but you can use whatever you want as long as it shows up on the board clearly!
Step 2: Use a center punch to get your holes ready to be drilled!
I used this center punch to make starting points in the board where I had marked with Sharpie. If you don't have a center punch you can skip this step. I find it useful to use one whenever my drilling needs to be precise.
Step 3: Drill your holes!
The drill I had wouldn't hold the small drill bit I needed so I ended up using a dremel.