NEW ONLINE STOCK TRADER HELP ON DIVIDENDS PLEASE?

Ok lets say I buy a stock on Tradekings or TD or whatever. How do I find out about the declaration date, the record date, the ex-dividend date, and payment date. This is all new to me I havent traded yet but im about to so I want to find out and how do I find out if a company offers dividends from the software or website of tradekings which is the one I will be using if you only know from other sites tell me anyway please.