
It is always best to start your line with the best bitch you can get.
The other option called 'breeding up' means starting with a bitch which is less correct or has mostly indifferent ancestry and mating her to a top class dog that is strong in her weak points.
If your super lucky you may get a puppy with all the improvements in the sex you want well marked and with show attitude. Great, it may even be a top winner. The problem is when you come to breed from this one ti won't breed on, as it is just as likely to pass on the faults from it's mothers side plus those from Dad (no animal is perfect) as well as the good points you got.
More likely is that in your first upgrading litter you will get a bitch a little better than her mother. You then repeat the process and if your really lucky in a few more generations you will get quality offspring more consistently, but you will always get the others from time to time.
Now you can mate two champions together with strong well bred pedigrees and not get a top flight animal, but nearly all the pups are likely to be of better quality overall, and when bred from are more likely to produce that quality puppy your striving for.
If you have no access to top quality breeding stock this is the option you have to take but it will take a very long time. Many breeders lines have taken lifetimes to develop and maintain. The back yard breeder with there hotchpotch matings can undo generations of hard work.
I started off with a well bred bitch, a bit long in loin, but good enough to win her stud book number, with the odd championship show class, and I would say was a middle placing animal. She came from a litter with a champion litter brother.
It was two generations before I bred a bitch good enough to win a RCC, (my first generation was two steps forward one back, and on balance was not as good as her mother, but improved on her in some points) and the next generation before I had one god enough to win CC's and got my first champion, that was 3 generations from my well bred bitch. The overall quality of the puppies in the litters has improved with my knowledge and the quality of the bitches bred from.
My advice would be enjoy your bitch as a companion and use her to learn.
Show her and see how she does and more importantly note which bitches beat her and why. You will pretty soon find your drawn and admire particular lines.
Ask the owners of the stud dogs you particularly like (more importantly the sires of dogs and bitches you admire and do well) which bitches have been booked to them. Speak to the breeders of the bitches that are going to have litters and see if one of the breeders will consider you for a second pick of their litter (if your really lucky first pick of bitches if they are planning to keep a dog).
You are better off with someone's second choice puppy with a great litter than the best of an average litter.
In your research and learning time you will become friendly with the owners/breeders of the stock you admire, lets face it people whose dogs you admire are going to be more than happy to talk to you.
Join the breed clubs and obtain copies of yearbooks/journals for as many years as you can. These will have photos of winning dogs and the breeds kennels, and you will be able to see how the lines have developed, see pictures of ancestors of current dogs, their show, breeding and health records.