I'm considering purchasing a system for home training, please advise

Malik, hi.

See the threads mentioning Pete Van Deusen’s Brain-Trainer system. This is generally used with Pocket-Neurobics EEG amplifiers.

Another option is the inexpensive Muse headband, but this is limited to measuring points on the forehead (and behind ears for the reference connections.) Muse is supported by a number of mobile apps.

William