1) they're just like any other normal cat - depending on them even some cat has irridation stomach due to germs n etc.. so tak good care of your cat/dog
2) cat's poo stinks - yes that depends on their food, but their poo stinks compared to dogs. that is y u need to provide litter box, and cat are pretty embarassed with their poo/pee, they always want to hide it
3) train? u mean toilet train? well it's their nature, just provide a litter box with good sand, (pls dont get those small rounds if ur cat is a small kitten, some breeders i known, their kitten died-got chocked)
4) normal cat food- those kibble will do especially brands like royal canin n etc
5) not really. depends but pls send them to vet for vaccinations and make sure they are fully vaccinated, check for ear mites n etc. cat do have disease so do some homework before getting one
6) persian cat does not poo???? oh come on, where does all the food goes then? ofcoz they poo but most kitten persian does not know well to groom themself so, some poo might leave stain, u have to wipe/clean it (best to trimmed the fur) once they grow older, no problem at all.
btw, talking about persian cat, bare in mind i've seen many petshop written PERSIAN CAT but they could not provide the purebreed cert to varify. i say this because many Domestic Long Hair cat are marked as persian cat in many petshop. persian cat has flat face. do some reading at www.cfa.org 'coz i know they're selling persians at high price ard 1k above. trust me, a petshop at sunway (i wont put the petshop name) selling their persian which is a DLH at a price of 1.8k !!! i was

yeah, go for Royal Canin etc. three of my persian cats died of urinary tract infections. two of them were 9 (human) years old when they passed, the other was only 3 years old.
the food has too much coloring, salt and artificial flavors. which made me to believe that persian cats' digestion system is more sensitive than others. my abyssinian cat still lives on the cheap food (i'm not rich enough to serve him luxurious cookies), and he's turning 6 this year.