The 100m theme takes a bit to fully wrap your head around. Here’s how I approach it, if it helps:
I take the team I’m interested in, say the 1927 Yankees, and use the ‘draft from historical team’ feature to download the whole squad into the draft center. That’s the basis of your team. You can fill out any missing spots, or swap out as many players as you want for any <300k player in the WIS database (doesn’t matter team or year). You can also use partial or combined seasons for any of your team’s players that may have played for two or more teams that year.
You can then enter that team as is if you wanted.
However, you will likely improve it by taking any of those players (or any one of the players that baseball-reference shows made an appearance for your team that year, even if they don’t have enough at bats or innings pitched to show up on the WIS lineup for that year) and ‘twisting” them one year away from your chosen year. So in our example, you can take any of the players on the 1927 Yankees and use their 1926 or 1928 season (doesn’t matter if they played for another team or not). It also doesn’t matter if you go backwards or forwards in time.
Now, again, you can stop there if you are satisfied. Or you can then take any other (remember, no clones so you can’t twist or use the same player more than once) player from the 1927 Yankees and use their 1925 or 1929 season. Again, it doesn’t matter which way in time you go (and it doesn’t matter which way you went with your first twist) as long as the twisted player is 2 years away from your original squad.
And you keep going like that, or stopping when you are happy with your roster.
But, remember, only one twist per step - ie only one player from one year away, one player from two years away, etc.
And also remember you can’t skip a step. So you can’t twist Babe Ruth 7 years away and use his 1920 season unless you have previously twisted 6 other players 1-6 years away from 1927.
Hope this helps and happy hunting.