Do a web search - hundreds maybe thousands of hits.
If you are really interested - get a VERY reputable company with many good references. There are a bunch of nuts out there. Make sure they can provide engineering in your state if you need it. Many cannot. I got involved in one project and when I saw their calculations - they didn't even show good - not by much but higher than I would have expected.. Their engineer said something likje "So..."
So - be careful.
And do NOT forget --- that log homes shrink - up to a couple of inches the first year. So all plumbing, HVAC, electrical, cabinents, fireplaces, etc have to be designed to "float"!!!!! or at least not "crash" into something else.
Good luck - have fun - most are quite beautiful.