Permaculture/Organic farming/etc.

Please forgive my intrusion. We just bought a small homestead in Iowa 
and I'm looking for ways to ease into resposible farming. However, I 
can't even seem the find info on chemical-free weed control! My 
husband is ready to do the chemical-spray thing and I've asked him to 
please wait until I get some "beginner's hints, tips, and techniques." 
Let's not let this beautiful piece of land go to the dogs! Where do I 

Thank you, thank you, thank you!  
Marjon Schaefer