In celebration of the recently concluded Swords & Wizardry Kickstarter here is a potporri of Bat in the Attic material you can use.
Majestic Wilderlands which is a rules supplement for Swords & Wizardry. The Book is $12 and the PDF $7
Blackmarsh a setting which works pretty much with any Older Edition and the PDF is free so you get going right away for your campaigns if you don't have something already. The book is $7 the PDF is free to download and to reuse for your own projects.
I have a free downloads of the following
A PDF of my How to Make a Fantasy Sandbox posts on Bat In the Attic
Plus a PDF on creating magic items that from another S&W project I am working on The Lost Book of Magic
And very rough draft well more my notes of a 2nd to 4th level adventure called The Elf Lord's Temple
So that should be enough to get folks started on their Swords & Wizardry campaigns.