Hi and welcome. Glad to hear that someone else is trying this, I tried it for the first time last year and intend to do so again this year. Here is what I recall from last year. Around the first of October I brought my plants inside and began a routine of 12 hours of light/dark. This was a compromise as I usually allow 14 to 16 hours of light for my Ficus and Jades.
I found that this, 12/12 was not sufficient to trigger the bracts to change color. When I began to suspect this I cut it back to 10/14 this seemed to do the trick and I got the proper response, but I was a little late for Christmas. As the newer, red bracts appeared I removed some of the older green leaves to enhance the effect. It was not quite as nice as ones that are forced commercially but not too bad.
As far as water I maintained moisture levels at a reasonable level, not making any attempt to either increase or decrease moisture. Just so you know, I had the plant in a very free draining bonsai type soil.