newbie trying to understand dividends

Hi,

Trying to work out how the dividends work. Seem to be the share to try this with. It looks to be offering a 10C dividend or around a 6-7% return if you buy the shares in four weeks.

Can someone who has watched or traded shares give me some insight as too how the dividend system works - Eg when do you officially have to own the share to get the dividend. What date do I have to buy them so that I can get this? How do they know my details to send me the cash.

Also personal opinion is appreciated regarding the effect on upcoming dividend payments on SP. Seem to me if a dividend payment is forth coming the share should become worth close to the dividend payment more just before the payment date and drop post payment?

Open to listen and take on others genuine opinions or to read about your experiences - the good the bad and the ugly not just the social media bragging rights like those who had after pay love to share constantly.