Making seeds isn't hard. I say go for it. No need to keep paying through the nose for seeds from what's become a pollen chuckers market.
Some things to think about are the type of strain you want, indica/sativa, hybrid, THC, CBD, flowering time, size of plant, etc... Or just whatever grows. I've been making seeds for years. I made my first cross over twenty years ago. I can't do a grow without making seeds. It's very rewarding when you harvest a crop and it came from seed you grew. You can do it exactly as you stated or you can make a plan. If you already have the genetics you want then just use those. If you want to get serious then get all the landrace strains you can and start working with them. That's what I've done. I started out with the basic hybrids and known name strains but have moved into the realm of landrace strains that are the foundation of everything out there.
Some good stuff to look at would be anything landrace you can get from The Real Seed Company, Ace, Cannabiogen, and Tropical Seed Company. They might not be 100% but it's as close as your going to get unless you personally go to the source. And even then many strains have already been contaminated and are not as pure as they were say 100 years ago. Get some Afghan, Pakistan, African, South American, Indian, Middle Eastern, and Southeast Asian strains. You don't need all of those but definitely South American, Afghan, and Southeast Asian. You can make some fire from that.
Have fun with it. The good thing is that you can name it anything you want. Make your own strain and have some fun.