showing your account does mean something. but most people woud be more interested in your strategy, analysis, and thought process. are you just guessing or are you consistent in what/why you buy and sell?
Your spoken claims of performance are virtually worthless.
Your personal track record however is not. Keep monthly statements with no "gaps" so that your claims of performance can be audited. You will need to demonstrate ability to "handle the market" with controlled drawdowns.
When you have done well enough and long enough, your track record will count.
No. Check with a CPA. Big name firms will be the most expensive... ask local CPA what they'd charge. Don't be surprised if they tell you "$5,000 per year" or more.