Do you mean a NamePros auction or an auction at a site like GoDaddy or Dynadot. They might be the same, but I am not sure that they are.
It seems you need to start low to get interest, although that is risky, unless you set a reserve (which you can't do on NamePros).
Ideally you would start slightly below the absolute lowest you feel you could take for the name, but in some cases that may lead to auctions that do not start.
In terms of strategy when (time/day) you start an auction and finish it can also be important, as can effectively getting eyes on it by having it listed under featured auctions, in your signature, perhaps on social media, and of course bumps.
On NamePros your title for the auction makes a difference, so make sure it highlights your name effectively.
Also, information to help support the worth of the name, fairly and clearly presented, helps I think.
There is also an art to the BIN price. Too high and ignored, too low and you may be leaving money on table. Probably best to set it after you have seen a day of bidding.
Best wishes,
Bob
(AKA the person who knows very little about auction success but always tries to help)