when i drive my honda civic from stop to 1st gear you can hear a knocking sound.

Get a little more specific on CONDITIONS-----Single clunk as clutch released --does it knock at the same cycle as a wheel turning and increase with rotational speed(not engine speed) Only when going straight , or is it worse on turns?

check all mounts for split or cracked rubber inside of mounts.check front upper,pass.side torque strut mount(dogbone)first.

Gear box mounting wear

Exhaust pipe hitting underbody....maybe from weak mounts! Lower gears generate highest torque yield & engine reaction... That's just one more 'guess'... Have 'mechanic' test drive..most don't charge anything for that.. Stop ALL the guessing!!!!

Motor mounts can cause noises under braking or acceleration. Call Contra Costa Auto Service and make an appointment to have them look at it Monday.