My wife says "Stop talking about it and DO IT!"

Some time ago, my kids and I came up with the idea for a doll. That "doll" idea led to a better "doll" idea ... to create a doll that would, well, I can't tell you that yet but, suffice it to say we all kind of looked at each other and thought "That would be sooo cool! Why didn't we think of that before?!" Since then, (about 4 months ago), we've said "we should do that!" 100 times. Finally, last night my wife (tired of hearing about it) said "Stop talking about it and just DO IT!!" So I told my kids I would start TODAY so we could make our "prototype/sample"! Thought this would be a good forum to drop in and mention it because of all the interesting info I've read here in the past. So far this morn I've searched "doll making" in my "Copernic" search engine (which, if you don't have you might want, I have the paid version but even the FREE version is an excellent search tool) and come up with lots of info on "doll making" which I've just started going through. So far, in scanning, I've seen nothing on the "talking device" we'll need to make the doll "speak". Also, nothing on "marketing a new doll" or suggestions on "how to protect the idea" although I saw info here recently on that subject (and will be re-reading). Any suggestions, recommendations, past experiences that might relate to this subject? Thanks folks