GD razors are a good place to start honing but, the standard 66 (i think) is one that has the stablizer in the way for honing. So it would need the stabilizer fixed before a serious honing can be done and come out right. You can google how to fix it as its been done over and over. A low cost user grade vintage from eBay would have been a better choice for learning to hone on. I started with a couple ZY razors. Same quality as the GD but no stabilizers.

Its best to stay with one brand of hone when learning because of grit differences between brands. They are not all exactly 3k from brand to brand but it can be done. Some guys learn to like a certain brand hone in a certain grit and do have a mixed set, but its from experiance in playing with lots of stones and they made a favorite choice.

I use Naniwa stones. My 1k is the pro but 2k,3k,5k,8k,12k is superstones. Still all Naniwas. A 10 and 12k are a bit redundant. Too close as was said. I have a 1k, 2k, 3k but dont use 1k, 2k, 3k in that order as its too small of a jump. X2 is a standard in progression. But not a rule. Some jump more than X2 by a little and other less than X2 a little, but its always close to X2. And learning to shave and learning to hone at the same time is not a good idea. Learning to shave needs to be done with a pro honed razor. Not a semi correct edge!