... It may be best left to a pro. 1) There are fire code issues, 2) there are flashing issues, 3) there are structural/design issues so the chimney doesn't com tumbling down, 4) it's truely an art to lay brick (not for the inexperienced in your case. That's just my opinion ...)
The materials are there. As I usually say, there are probably books out there too. Search the Book WEB Sites. Talk to a log home contractor. My best to ya and hope this helps.