Sound Proofing

[glatt]

Honestly, I'd start by putting the forge and anvil outside under a nice shade tree and just working in the back yard. Lots of fresh air, no worries about chimneys or sound proofing. The anvil will ring, but I bet the neighbors won't complain. If it's like every typical weekend around here, they won't hear you over the sound of lawnmowers, weed whackers, and leaf blowers. Meanwhile, you will get a feel for what works for you, and then you will know how you want to set up your shop if you want to come inside.