Hiya Sam
Welcome to the forum
Dont worry about sounding daft - you definately dont! everyone needs to ask to learn, and its great to hear people asking waht is best for their new pet
Robos can be kept in normal barred cages as long as the bars are close enough together to stop them from escaping, but cages like the rody, rex and lux are really good becasue the bars are only on the roof of the cage. Glass tanks are also great as they cannot escape from them, and the bigger ones can give them plenty of room too. It is really down to personal choice as to which cage you use - they all different pros and cons - take a look at the cage review section of this site.
The only cages i wouldnt recommend are the rotastak / crittertrail type ones with lost of compartments - these are not really suitable as they dont have enough ventilation, dont really have enough room and robos can have trouble climbing verticle tubes too. You only have one robo, so you wouldnt have the problems of them being territorial, although this another problem with these cages.
I use shavings for most of my hamsters, the only exception being very long haired hammies who get cardboard squares - but all of the others, especially the robos get shavings with no problems at all. I am sure megazorb would work just as well too though, so again, personal choice - and yes, they love to burrow and dig so whatever you use you can pile it very high for them
Roborovskis love sand baths and will use them to bath (roll) in but as time goes on you will notice it getting dirty as they will also use it as their toilet!! but this can be a good thing as it does mean they can be litter trained to go only in the box - but, i have never tried a bare floored cage, so not sure how that would be for them, but i dont think i would try it it myself - they love to burro and dig, so i think this would prevent them doing something they enjoy.
Roborovskis dont really get thier cages very messy anyway - not like a syrian! so there isnt really much mess to clean up, they are very easy to clean out, especially with high shavings to absorb everything.
I think i am one of the few people that only uses bowl for my hamsters to drink from. I occasionally use water bottles when i have very young litters but apart from then i always use bowls, so yes, hamsters can use bowl perfectly
With a cage or tank the bigger the better, so whatever you can get try to get the biggest possible!! but of coures this isnt always possible, but the rody is fine for a sinlge robo, so anything bigger is great
With food it is best to get a complete hamter mix like harry or burgess and then supplement it with extras such as seeds, mealworms, chicken, egg etc.
I hope i have helped
but please feel free to visit my website to see more info on all of the above
Tammy x