Thanks Reuben. Good info as always!
anytime Kevin...
If dog1 and dog2 are similar in looks and hunt I would start as you did. but I would not use either male again if possible. I would use a son of dog1 and a grandson from dog 2 as the main stud dogs for a while on the 1/2 sisters and nieces etc. etc. I would move the females a few generations to improve the line asap and then hold on to them longer once you are getting a high percentage of good pups. at this point you just need to breed to replace a dog or 2 every now and then.
I'll give my reasons on the son and grandson for stud dogs. The grandson can be used as the main stud dog and because he is the grandson he already has been evaluated by you as well as his parents and grandparents so you know what you have or have had and he is what I consider line bred.
the son is the beginning of the line breeding program and he is somewhere between line breedind and an outcross so he can be used on the females further down the line...but you can get a litter out of him every now and then just to see what he produces and you have the choice to keep one or 2 or sell them all...just makes sense to me to maintain some flexibility by doing it this way.
If it were me I would do it this way, this would be the road map to reach the goal...but the other part of linebreeding would be in the selection of the pups/dogs, otherwise it wouldn't work...