Looking for developer(s) to update an old coin, possibly to do smart contracts and other things. Where do I go about doing that, any ideas on cost, etc?
Look for developers in the Service section if you'll pay in bitcoin. Another good section to spot is also the Project Development in the forum. If you still can't see that then just go to freelancer websites and have those developers go into your thread with the same posting.
The cost of it varies on the experience of the developer. But, I am sure that this isn't going to be as cheap as some might be thinking since it's a task and skill that's in demand and needs technical knowledge.