MEHANO trains

hello all i have 3 sets from MEHANO company and i buy a new 2-8-4 MOUNTAIN, how can i use steam for MOUNTAIN 2-8-4? i hear from SEUTHE germany can i buy something like this.
It is possible to upgrade the 1st tree sets i buy? the sets are from train line that means is more or less a toy.
MEHANO trains can upgrade the couplers or something else?
I’m very new on this hobby and i need some help

Thank you all

I believe that Mehano is a line of HO trains. You might want to re-post your question over in the Model Railroader forum - there might be folks over there who have experience with Mehano and installation of smoke units in HO gear, and who might point you toward a source for the smoke unit.