I want to make a CNN with the brain waves that I got with OpenBCI.

I want to build a CNN with brain wave data taken by openbci. The data fetched is 5000 at 250hz. (8channel) How should I make a CNN? I want to identify brain wave data using CNN. For example, I want to distinguish the difference between the brain wave holding the right hand and the brain wave holding the left hand by CNN so that it can be identified when new brain wave data comes in.