See my answers after your questions:
Before I get my chickens, there are a few things that I would like to know, I have isolated these in to three specific issues:
- Is there any possibility of chickens spreading diseases to me or my neighbors?
NOPE, none that i know of.
Any diseases that can be transferred through eating one of their eggs?
NO Diseases. There's always a chance of salmonella bacterial contamination, but it's found to be more of a chance of salmonella in store-bought eggs than there will be in your backyard chickens. Just don't eat old eggs or eggs that are cracked. If an eggshell has dirt on the outside, just wash it off before cracking open the egg.
- Will the hens be loud? Not typically. Some hens cackle loudly for a few minutes if they get excited by something. Not even close to the sounds a cat or dog would make. Nothing to worry about.
- Will the hens be smelly?
The hens themselves are not smelly unless they walk through something stinky and it sticks to their feet. Their coop can get smelly if you don't maintain it. But many people use the deep litter/bedding method and there is very minimal smell. Unless you're planning on having several hundred chickens, I doubt your neighbors would ever smell your coop, unless they came to your yard and stuck their noses in.
I would like to know if you think these would be problems, I would also like to know of ways that I could prevent these problems.
My suggestion: Just go for it -- get 2 or 3 hens and enjoy them. They will be less work/smell/care than a dog or cat. It is generally a myth that chickens are "dirty and smelly". People have no idea how clean they are, or what great pets they make.
Or, if you want, go visit several different people who have chicken coops in their yard and make your own observations.