Hi Jay and welcome to the forum. There are plenty of members who can give some very good advise as I've discovered.

IMHO the best way to motorise your points is to use the Viessmann products. Although they are "an all in one" unit, i.e. they have the motor and the decoder, I've found them to be more reliable. If yo look through the forum there are a few threads dealing with this topic. The Marklin motor, to me, is just not reliable enough. I have over 100 points with Marklin motors and I'd say about 20% fail. Therefore, I'm slowly changing them to the Viessmann product. The only problem with the Viessmann 4558 is that the decoder will not sit neatly under C track turnouts - fortunately for me, my layout is sitting on 38mmthick foam, so I can gouge out some foam to house the decoder. The 4558 is cheaper than the 4554, however, the 4558 is designed for C track - even though the decoder won't fit properly under the turnout. The programming of the Viessmann units is a bit more difficult than the Marklin, but you get the hang of it after awhile. My preference is the Viessmann and note that this is just my opinion.
Regards
Greg