
I didn't show my foundation bitch until she was nearly two (she also had a champion sibling).
A boy I bred wasn't shown until he was nearly two and became a champion.
Never too old to start, even if you don;t do well it will teach you a lot.
Personally unless I was planing to breed on a line I would not breed just a one off litter from my bitch, especially if it is a numerically strong breed.
The expense (health testing alone can be more than the price of a puppy)and responsibilities are huge, and if you just want another pup to show your far better off taking your current dog to shows where you will be able to watch the breed carefully, decide which lines you admire and get near the top of a waiting list for a puppy from a breeder whose stock you like and whose dogs (especially ones sold to others) do consistently well at shows.
This is a far cheaper option and more likely to be successful than trying to breed a good one yourself from a bitch whose lines you perhaps do not know enough about to find her the most compatible mate, to get the resulting puppy you hope for.
It is not that common for a novice to breed a really good pup in their first litter unless they have had the luck of a top class bitch to start with, with the help of a really good breeder mentor..