i put my laptop on top of a box - some people use books for this - so the top of the screen is more or less at eye level, and i distance it somewhat (an arm's length) from my eyes/face. i use a trackball (logitech m575) and, because i don't use the laptop's keyboard, i have a bluetooth keyboard (logitech mx mini). try to get a decent chair - one that you feel comfortable in for fairly long periods of time and allows you to sit fairly up straight, comfortably. i favour using a desk or table that's not either too low or too tall, allowing me to rest my arms on it gently and with enough depth that i can rest the arms from my elbows.
i have a ergodox that is, unfortunately, packed a way at the moment. i regret not bring it with me as it'd improve my "ergonomics" immensely.
if you can't get a decent table/desk consider getting something that sits on top of your low kitchen one to get it to a decent height.