For starters, check out these websites:http://www.japan-guide.com/e/e3776.html
http://www.japan-guide.com/e/e3775.html
http://www.jnto.go.jp/tourism/en/f006.html
For hotels, here's a starting place:
http://www.mapfan.com/en/en_m.cgi
Enter Aomori for the prefecture, then zoom out and move the map to Lake Towada. Center the map on the area where you want to stay; then in the left side, click on the pulldown menu and select hotels. Click search and voila!! A starting point.
Good Luck!!