trying to organize my house but not sure what i can do to create more space,?

[a little curious]

I was down my entire pregnancy and my house collected alot of junk, now Im trying to reclaim the space but the baby stuff takes up soo much space and im trying to run a day care too, now that my little one can crawl I need storage, floor space not cluttered with toys a way to store stuff for the changing area, he has a dresser that is a changing table on top, and my room houses his crib my bed my computer his dresser and mydresser and my husbands too, there is walking space but it gets cluttered easy,like as soon as i shp for diapers and stuff,
also my other three kids rooms are upstairs but they are small and i am not sure how too help them organize their space, someone please give me a few ideas, I also need laundry room and bathroom ideas
Thanks
I forgot to mention I only have 2 closets down stairs and one that has haning spac and my older kids are 12,11,and 10 then my baby is 7 mos, the older ones could help but I wouldnt get any thin done. and the baby wont let me do any thing My DH just puts him in the crib And I feel bad when he cries,.
Dont get me wrong My big kids do do chores, we have a chore assignments every day, This is how we lasted through the pregnancy, now they have lightened a bit but the whole problem was caused because the kids did chores and junk didnt go to the garbage. now im over run with it. I do have toys in the living room BUT, they are the babies and daycare toys, this is some of my problem, int my living areas thay clean, its the rooms where I dont spenmd my day that are my problem.
sory about spelling i am typing in the dark.