Double brick homes

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I live in Ontario, Canada. I own a double brick Ontario Cottage. The brick has been painted and the eavetroughs do not all extend to the grade level. I noticed quite a bit of moisture in the old stone foundation when I purchased the house. Since purchasing the home I have noticed mold growing about a foot off the floor inside two closets which have no ventilation when their doors are closed. I have a dehumidifier which runs continually and drains into the sump pump hole in the basement. The home was originally built with 10' high ceilings which have been lowered & drywalled. The old ceilings remain in the cavity as does the insullation which is approx. 3" fibreglass above the new ceiling and rockwool above the old ceiling which is not sealed to the new cavity.

In an area where I noticed that the paint is peeling on the brick outside I have removed the first layer. I intend to remove the outer layer of brick and re-install a new layer. There does not seem to be any air space between the two wythes of brick. The new layer will be only 3 1/2" in bed depth versus 4". I can over hang the foundation stones to gain more space if necessary.

My question is what is the best and most economical way to install the necessary air barriers & flashings to make sure that moisture is being shed to the outside of the house.