Flash, no one knows quite how it will work out for you, some men regain continence very quickly but others have ongoing issues. In terms of pads the best are probably (unless your have them provided, it seems to depend on postcode) the ones you can buy easily. In my case they were the ones made by Tena which were in my local Tesco. I found own-brand significantly more bulky and unpleasant to wear.
And coming out of hospital you will probably want some of the incontinence underpants to ensure protection for the first few nights, though in my case (and that of many here) I became continent at night pretty quickly. Even after that you may want the insurance of protection in bed, some recomment "puppy pads" but I found disposable baby-changing pads ideal to put under the bedsheet.
Certainly in the early days you will find leaks depend on what you are doing. Sitting still is fine, walking around is more risky, anything that involves core muscles putting pressure on the bladder is definitely risky. If you are lucky you may gain complete control quickly, most do so over a period of months, and in my case there has been an ongoing leakiness mostly dealt with by one pad a day but having a spare pad in my back trouser pocket gives me confidence that I can cope with bad days. It doesn't stop me living life.
Good luck for Monday.