There is much detail to be found on the web about growing and looking after Salvia divinorum. As you might expect, some of the information is contradictory.
One reason for this is that the advice will be coming from different geographical areas and therefore relate to different circumstances. For example, a point that I make in the section on taking cuttings is that it is important to cut the plants back in the autumn. As with all my advice, this is based on personal experience and circumstances. The plants simply will not grow much in the winter. If you live in southern Spain or deep in the heart of Texas, then this advice may not be as critical and you may have some different concerns, for example, humidity.
On my web-site here I suggest that building a humidity tent is not really worth the bother because the plants can adapt to lower humidity. I have a humidity measurement suggesting that the average ambient level here is between 40-60%, which is fine. However, going any lower than this might be pushing the plant beyond its ability to adapt. If your conditions are more arid you may need to give this more consideration Having said that bear in mind that you certainly do not need to get 100% humidity.
Even if your circumstances and conditions are quite different, I hope there will be much information of a more general nature, for example, advice on potting and the type of soil to use that you will find useful.
Lastly though, I would say that with all the advice you can read (including the information here to some extent) it's quite easy to go over the top with your plants in trying to provide them with the most perfect and ideal of conditions. It's natural to want to take the best care of them but remember that a lot of advice is coming from 'enthusiasts'.
I'd go along with something that I found on the Internet, which suggested that they had heard so much about the care and maintenance of the plants before actually seeing one that they expected something kept alive with all manner of alien contraptions and artifice. Over all these plants are quite hardy, adaptive and easy to grow indoors.