You have many options in Golf League Tracker when setting up a new player, or a new league in which the players don't have a score history.
There three main settings for your league which matter in how new players get handicaps:
If you're a new league and have handicaps for your players, perhaps from an older system from last season, or you have new players to your existing league, the Handicap Padding setting will create this number of "Padding Scores" which act as a real score in the player's score history, which is representative of the Starting Handicap for that player.
This allows you to give a player a pseudo score history without knowing or entering actual scores into the player's Historical Score list. If you have a lot of players, this is a quick way to give them a score history. The feature is useful because it will prevent a new player's handicap from changing wildly the first few rounds of the season.
As the player plays actual rounds, the Padding Scores will roll off of their score history just as if they were actual scores
Click here to see an example of a handicap calculation with and without padding.
If you leave a player's starting handicap blank, it will be populated once the player reaches the minimum number of rounds required to establish a handicap. At that point, if Handicap Padding is >0, then the rest of the scores will be filled in with those padding scores based on that starting handicap. If Handicap Padding is set to 0, then the score history will just build up as the player plays more rounds.
Note that if a player does not have a handicap established, you will not be able to Record Points until the player gets a handicap, at which time you can go back to previous rounds and the Record Points. It is recommended that you keep the number of rounds required to establish a handicap no greater than 2, so that you're not too far into your season before you can record points for your league standings. Remember that if a player misses a round, you could be a month or more into your season before you record points if you require 3 or more rounds to establish a handicap for a new player.
For the administrator, you can go into the League Setup and enter Historical Scores for a player, which are actual scores from an earlier time (usually the end of the previous season and Golf League Tracker will include those scores in the handicap calculation. So if you use the previous 6 scores for your handicap calculation, it would be ideal if you entered each player's previous 6 scores from last season.
Golf League Tracker has the ability to import historical scores from another system, to alleviate the burden on you entering scores one by one. Take a look at this article for details on importing data.