New player, looking for advice

[Imp]

Generaly anything between approx 3-1 infantry to tank ratio works well, the reverse or anything in between.
Or put another way one platoon of tanks per inf co or the reverse.
Add to that one section of arty per company plus a couple extra on top.
Support as see fit AA ATGMs though USA 85 comes witha bundle already.

Infantry heavy tends to be easier than tank heavy as scouting with tanks is not the best way to go & you get more units for the points hence coverage.

This is a general setup
Adjust for terrain & opponent if he has no tanks to write home about you dont need many/any.
Towns woods etc get even more infantry.

Tailoring for force you mentioned doubt any opponents will have TI so if terrain allows useful but infantry for ease of play I would only take about 1/3rd transport as Bradleys if vs Russia as other vehicles are easier to scout with as no ATGM. Handy in overwatch on your tanks though as if I remember correctly Abrams gun is not that good this time period.
If you go for 3-1 ratio suggested infantry can find out whats coming & let you figure out how to deal with it in theory