what's your location? Maybe a geeker is near you and can give you some face to face knowledge.
i wouldn't break a perfecty good urs4 just for the motor and stuff. there's plenty of motors hanging around that people aren't using. snag one of those.
for suspension, most common is springs and some new bilstein struts or something name brand. You can go the extra mile and custom make some coilovers using the stock strut housing (cut off seat, weld smaller seat and sleeve, buy springs and hat.
urs4 front hubs have to be machined to fit the cq if you want to do a 5x112 swap. the rears don't swap over directly. then you have to figure out some kind of brake set up, most common is the porsche big reds by using rs2/apikol/034 carriers.
there is a ton of information on this site, just have to dig for it. Read read read read read read. then ask.
also if your coupe is your daily, there's a lot of downtime for doing upgrades such as suspension, brakes, let alone engine swaps. You have another car to drive in the meantime?