Some useful links to get you started (see Learn for dictionaries etc).
The Scots Language Centre is the official source information for all things Scots.
Scots Language in Education includes a range of materials for schools.
Scots Hoose is a popular resource collection for Scots language teachers.
Itchy Coo is the biggest publisher of books in Scots, especially for bairns.
Luath Press published a range of Scots language books (and Scottish interest books too).
LALLANS – the Scots Language Society publishes the only magazine in Scots.
Oor Vyce is a newish campaign group.