Lincoln Log home that needs sealed in cold weather.

I have a Lincoln log home that I purchased at foreclosure. It is 22 years old and I don't think it has ever been stained since it was built. I could be wrong though it needs stained and chinked badly.

I just realized the wind is coming through the front main wall in between the logs.

It is basically the start of winter here in Ohio. What can I do to stop the wind from coming into the house? What kind of caulk can I use in this weather and/or other things that will help with caulk if any?

Any help would be appreciated.

Thank you,

Z