First I'd like to say welcome, then check out the other skoolie groups around....they have a LOT of archival questions-and-answers for you to read. SERIOUS reading ahead of you.......and that includes HERE at Skooliedotnet, so start reading. Lots of the questions you're going to ask have already been answered, HERE.
Apart from here, the first and best is Schoolbusconversionnuts at yahoo dot com (beware, the moderator is crusty but a good-hearted type), skoolieconversions at yahoo dot com is another. Huge archives/links/etc.
Consider local school auctions for the best prices/choices. You can sometimes get a local skoolie for a grand or two, with FULL documentation, maintenance records, etc, some with recent engine/tranny rebuilds and new or recent tires. Some will even have hte manuals/notes/scribblings from the school kids in them...
Beware that most skoolies have a 6'1" ceiling.
High schools will tend to have rigs with higher ceilings, saving a roof raising. They will tend to have the desired transit styles as well, which makes for more usable interior space for it's length, and they oft-times have underbody storage as well.
Local bus auctions by dealers may also be a good source.
Caveat Emptor! And keep posting here so we know what's going on with your setup.
The tool storage is nice, but where do I put the bed?