Day Trading

Me a newbie to the market… but dont startoff with the RISK factor involved in day trading unless necessary

Are buy and sell orders put by u executed in click-time (generally, irrespective of volumes traded)?Can u explain abt ask price and bid price in general?

What abt Direct Access Trading with no brokereges….is it open for everyone?

If its only thru cash with no margins…then can we own the shares at the end of day if prices r down like normal buying of shares? or diff set of rules apply for ID trading?

Is thr a min. amount to start with for trading?

In brief,what and how are diff types of ID trading done ?

TIA