New trader taxation question

Hi all,I apologise if this isn't the right place for this post. I have some great mid- and long-term positions, but am looking at taking a few short-term positions to try and take advantage of current market volatility.
Can anyone explain the tax implications and obligations of such trades? I am aiming (predictably) to use the proceeds to try and snowball a little to increase my working capital. I assume that I have to declare the proceeds of each profitable trade as income. Given that income derived from investments has a different place on the tax form, does anyone know how I am supposed to keep evidence for records of said?