I've started on the basement! So far it's just been cleaning, organizing the boxes and stuff that are stored down there, and finding stuff to put on top of the sump pump pit cover because it was super creepy!
The toys and things are now in the play area. I used the extra set of seats from our van as a kind of couch so the kids had something comfy to chill out on. We had an extra floor lamp we no longer needed so I set that up to get more light in the darker area of the basement. So far I've spent no money, though I know I'll need to. I still need to get a rug for the main play area, some kind of tote boxes for the things that are currently being stored in boxes (for protection in case of flooding and to hopefully keep the kids out of all of it), and some decorating things to spruce it up and get rid of the bit of creepy basement vibe that's still going on.
More updates and pictures to come!