An asset to the breed, in breeding terms, means that your bitch and the stud dog is of the absolute top of the line in terms of breed improvement. That means years of experienced breeding to produce both parents so that they can produce offspring which are an improvement on current offerings.
For many reputable breeders this might mean importing sperm from a thoroughly assessed and tested dog from overseas. It does not mean findng a local dog which will do. It is a million to one chance that you'll both have a thoroughly suitable bitch which is an improvement to the breed than any similar "one in a million" in your opinion and conveniently have a dog which will improve the breed specification in terms of health and temperament locally. Literally, a million to one chance. Anything else makes you just another backyard breeder.
I'll raise the issue of you asking how much a pup is worth on the market. 
I'll raise the issue that you don't know about the tests needed and are asking if they're necessary! I'm frankly shocked by that alone.
I'll take issue that it's "ridiculous" that you don't have prospective homes lined up (and a reserve list in case of drop-outs). Any informed breeder will have both. Any informed breeder would know that this is a pre-requisiite of good breeding practice.
I'll back those who are telling you that 6 is too old to breed a bitch and wouldn't be supported by any responsible breeder. I'll back those who raise the subject of potential cancers in an unspayed bitch, especially an older one, of pyometra and of the potential distress, risk to life and expense to the owner of a caeasarean.
I'll refer you to other posters comments about the number of dogs already in this world without homes and those which are killed because of it.
I'll ask you where you intend to advertise and sell any pups.