Yes you have a robo, they are lovely little hams. They can be nervous about hands in cages but I'd just keep taking things slowly at his pace. He sounds really sweet
Pet shop staff are not animal experts so you're best doing your research separately really. Robos absolutely need sand at all times, more than other hamsters and preferably in a larger container. Something like a large ceramic roasting dish or something, in fact the Germans recommend that at least one third of the cage is sand. Just make sure the sand you use isn't 'chinchilla dust' and is definitely sand!
The wheel, they need an upright wheel at all times and the saucer is just an extra if there is room in the cage. If you get a wooden wheel you'll want to firstly sand it down or there might well be splinter issues, then you'll probably want to plastikote the cork lining to water proof it. Although you might be better off getting a silent runner or wodent wheel if he does pee in the wheel or if he's using the silent spinner alright then you could stick with that one.