Bid is the price of a share a prospective buyer is prepared to pay for a particular scrip, while offer is the price at which a share is offered for sale.
Brokerage is the commission charged by a broker for purchase/sale transaction done through him.
Clearing refers to the process by which transactions between members are settled.
Refer to Account Opening forms and guidelines
Karachi Stock Exchange Limited
Securities and Exchange Commission of Pakistan
Central Depository Company of Pakistan