Interested in propagation .How are peach rootstocks produced?

Hello,  Lately I've become interested in producing my own peach rootstocks and I'm confused by what I seem to be finding on the internet about doing so.  

I wanted to make a stooling bed to cause suckers to form on Peach tree rootstock material (I was mostly thinking of Lovell rootstock) but I'm starting to think that this isn't the way that it's done.  I'm starting to think that Lovell rootstock is grown from seed somehow.  Is this true?  

There are a couple of things that I don't understand about this.  First, how can a rootstock supplier afford to grow enough rootstock to supply the market by using seed?  Second, how can a rootstock that is grown from seed be genetically the same as the parent rootstock?.  

It took me a while to realize that there must be something different with peaches compared to apples, because there is a ton of information about apple stooling beds, but very little information about growing peaches in stooling beds.

I guess my final questions are about a peach rootstock stooling beds:
Are peach tree stooling beds used in the industry?
Is there a type of common Peach rootstock that is royalty free that produces suckers and can be used in a stooling bed?
Is there something different about peaches where I can just gather peach seeds and start planting them for rootstock?
Thanks in advance to anyone who can clear up my confusion. I really appreciate the help.  :)

Take care
Tim

In NZ the most commonly used peach rootstock is a variety called golden queen, a firm, juicy orange fleshed clingstone that is an excellent all round peach for both eating and bottling.

It grows true from stones and is very hardy.

It will bear fruit within three years planted from a stone.

Is there a similar variety available to you locally?

According to my neighbour, who has been experimenting with apples - the rootstock should be from the same fruit group - in your case a peach, or nectarine.  OK to grow from seed, then graft on the variety you want,  or several if the rootstock tree is big enough.   Best of luck - I tried with apples, slips supplied by helpful neighbour, grafting onto an apple grown from seed - they don't produce to type.  All went well until the feral deer decided the tree was great food.

Tim, said,
I guess my final questions are about a peach rootstock stooling beds:
Are peach tree stooling beds used in the industry?
Is there a type of common Peach rootstock that is royalty free that produces suckers and can be used in a stooling bed?
Is there something different about peaches where I can just gather peach seeds and start planting them for rootstock?
Thanks in advance to anyone who can clear up my confusion. I really appreciate the help.  

Those are a lot of questions.

I have read that stooling beds are used by commercial nurseries.

I feel the best rootstock is what is used where you live.

Your profile says Pa so this might be helpful from Penn State:

https://extension.psu.edu/the-changing-peach-rootstock-picture

I hope this was at least slightly helpful ...