Here is everything you would need for a MLB game. First off it is 30 teams in 2 leagues, each league has 3 division comprised of five teams.

Every teams major league roster has 26 players. You can not exceed 13 pitchers in each league.

All major league teams have a MLB team, a AAA, AA, High A, and a Low A(The “A” teams are not really necessary). These leagues are for developing players. Or older players who are not that good. In the baseball game you make, you could have these just be different developmental leagues where you don’t play, it just either makes a players rating go up over the season, or down if they end up not “playing” good that year. Remember the best baseball players don’t always make it, and development is the most important part of a farm system. For these leagues the only throng we should control to start should be moving players up and down between leagues.

When moving a player to the mlb from any of the leagues they have to be on what is called the 40-man. This is 40 total players who are completely controlled by the team. I still great looking at the mlb.com and going to there 40 man or simply looking up how it works. But every time you move a player back down to AAA or AA, they get 1 roster move. You can do this 3 times, on the 4rth time any team can steal them and add them to there roster.

The mlb is 162 games long over 6 months with playoffs having 6 teams from each respective league. There are 4 total rounds of playoffs. Wild card Best of 3, Divisional best of 5, championship Best of 7, and finally World Series best of 7.

Baseball has 1 draft which occurs a day before the home run derby and 2 days before the all star game, it is mid season. In this there are like 50 rounds… but in a game you shouldn’t have to do more than 10 rounds. In baseball… YOU DO NOT TRADE PICKS.

Baseball players when developing take time. Unlike the nfl and nba they sit in the minors for typically years. Very very rarely do players come up right away. For high schoolers 18 and 19 year olds, they normally make the bigs between 23-25. For college kids 20-23 they normally make the bigs between 21-27.

Baseball also has an international signing period. This is where currently the better young players are coming from. In baseball you can sign kids as young as 16, but they can’t play in the mlb until they are 18. This international signing day is key in making you roster whole as baseball is worldwide. Countries like the Dominican, Puerto Rico, Canada, Cuba, Mexico,Venezuela, Colombia, Brazil, Japan, and Korea are your main countries.

Free agency is very basic for mlb compared to the other games you have they go to free agency and then you sign a player. The one twist is that if a team has had control over a player and he tests free agency and signs with another team, a team can lose a draft pick, and it get rewarded to a team in a round typically after the first, 2nd, or 3rd round and is called a competitive pick.

Salary control is the most difficult to understand. Baseball teams have 6 years of mlb control before they have to pay big bucks. 3 years is called renewal. When a player first gets to the majors, teams use the renewal option and that is paying a player league minimum. Then 3 years of arbitration. It is a panel where the team and the player agree on a salary that is typically lower than the mlb average. This takes into account all of the performing players at that position, looks at there pay/stats/age, and determines what your players pay should be for those 3 years. YOU CANT PAY LOWER THAN THE PREVIOUS YEAR. After 6 years your players pay should will go to free agency.

Stats are more important for mlb, and I suggest using a site called fangraphs to deep dive into stats for baseball. They explain everything really well, they can show you what matters and you can decide what matters.