Jazz and Birdie are lovely. Welcome to the forum. This forum is a great place for pet owners. Unfortunately the breeders and show enthusiasts are not as active here anymore and that is probably more of what you need.
If you are starting out, it is difficult to know what you don’t know. Finding a responsible mentor would be a great start and can help you fly through those challenging “freshman and sophomore” years for showing and breeding. They can help you avoid the pitfalls new people make and hopefully help you last longer than the 5 years most inexperienced breeders last before they give it up.
The best place to find a mentor is your local Golden Retriever Club or all breed club. Keep in mind you want a great mentor, not necessarily the first person offering. It is not uncommon for the friendliest and first to offer are very new or inexperienced breeders so they are not that helpful in the end. You want someone who is successful in the areas you want to be who is ethical, honest and does the right thing, not the easy thing. Those people tend to be more aloof and you have to work to get their help. That are also more likely to very honest (sometimes painful so) and don’t beat around the bush.
Please take time to review the Golden Retriever Club of America’s website for some basics.
These four links are a good start as they are ones that you likely need right now. https://www.grca.org/about-the-breed...ode-of-ethics/ https://www.grca.org/find-a-golden/m...goldendoodles/ https://poodleclubofamerica.org/just...designer-dogs/ https://www.grca.org/find-a-golden/m...en-retrievers/
I am going to make an assumption you want to do the right thing in regards to Golden Retrievers and hope I am not wrong. So, stop what you are currently doing now and focus on learning. You are very close to damaging your reputation beyond repair with ethical Golden Retriever breeders. Do not breed to poodles. If you do, you will have severed you connection to Goldens so thoroughly, no reputable breeder will deal with you ever again. Next, stop testing underage dogs. PennHIP is a viable option but only once the dog is over 24 months. You can tests eyes now as they need to be done yearly anyways or you can wait to start testing until 24 months, it is up to you. The heart must been tested by a Cardiologist and that can be done at 12 months of age or older. I would encourage an Echocardiogram as European lines have issues with SAS (Sub-Aortis Stenosis) so that is what I do for my European bred dogs. SAS is nothing to fool around with. Do not have a regular pet vet do a heart exam of OFA, it is not enough for Goldens. Wait until 24 months then do the hips either OFA or PennHIP and send them in to OFA (yes OFA will post PennHIP results). Also at 24 months old do the Elbows through OFA. Hold you breath on those because this is another area European bred dogs have certification weaknesses.
You can DNA test now. The common ones would be the PRA tests (3 of them), Ichthyosis and NCL. If you do DNA panels, you will get more but those are the ones that most commonly cause issues. Once you have the results if you have an affected or carrier, you will no not to breed to another affected, carrier or untested dog for that particular DNA test item. Normal means the status of the other dog could be anything and no affected puppies will be produced.
I can not recommend strongly enough to find a successful mentor who will push you to learn and do what is right, not what is easy. Goldens already have enough breeders who don’t really care. They could use more that do. I hope that being a responsible preservation breeder might be your goal too.