Cleaning tips ! ?

I have been in a 1 bedroom 1 bath house with my twins babies that are now a year and a half old. We’re getting ready to move soon & I have so much clutter and mess. It just seemed like no matter how much I tried organizing I couldn’t. There wasn’t a lot of space for our things. Now that I’m trying to clean and get rid of things I can’t seem to know where to start. It’s so overwhelming. Any tips?