i'd clay the car once or twice a year, like after winter, to get all the muck embedded in the paint off.
whenever the weathers nice and you have time, wash, polish then use a hard wax on it out of a tin, maybe once a month in the summer.
I'd try my best to give it a wash once a week if its my daily driver, even if its raining and you dont get the chance to use any wax its still better than leaving it mucky. use something like this to give it protection:
Or this aqua wax which i find the best product ive used to date, very very quick and easy to put on and looks amazing.
You can go way way way more into this but it just gets confusing when your starting out, just buy a nice woolly mit to wash and build up your collection of bits as you go.
EDIT: clay, as long as it takes || wash polish wax, a few hours || quick wash 45 mins