Good answers phinox, especially regarding keeping any handling (if any) to a minimum and making sure s/he isn`t dropped or stressed by trying to handle too much. Robos should have a decent sized cage ( similar to a Zoozone 1 size) with a good solid wheel and they will entertain themselves.
I never got my robos out on the floor because they had enough room in their cages to run about, but it depends on how easy yours is to handle or if s/he wants handled/played with.
Diet should be a good quality hamster mix with good variety and break up any large biscuits withing the mix as robos preder to eat small seeds and flaked grains. You can add budgie seed millet and buy a bag of millet spray and break pieces off as an extra treat. Make sure the water bottle is low for easy reach. x