Pet rat advice and info?

Hey guys, just a quicky really. Finally after years and years of wanting a rat i have just purchased two 2month old male dumbos with my girlfriend. Its obviously our first time and abit new to the whole thing and just wondering if fellow rat owners could share some advice with us. One thing that is really bugging us is the smell from the cage as they seem to be pooing everywhere in there. Within an hour of the cage being cleaned out we are finding at least 30 poos in there and it absolutely stinks, they are also doing it all over the house when let out too. We have noticed some improvement tside the cage but it varies from day to day if any. Tried two sorts of litter including carefresh (Kept original light cellulose based cat/rodent litter in littertray) and also brought some cage fresh granules for the bottom of the cage but still doesnt seem to make any difference. We are currently trying to litter train and have also been putting the poos in the litter tray but still no joy whatsoever. Are they any products/litter/bedding that will help and also any supplements or food that help too?? We have heard that having the guys doctored may stop them weeing and pooing everywhere...is there any truth in this??? They have been awesome so far and already are learning to spin, be called by name and do various other tricks so we know they are far from not being able to learn. What techniques to cleaning and how you lay everything down can you give us. And finally a little worried about bruno the bigger of the two, he is sneezing and making noises every now and then and we also found him sprawled outside his his bed almost lifeless. Should we be worried?? Any help would be cool and much appreciated. Also could you give any links to sites that might help? Many thanks :-)