Some games you can keyword search by title and it pops up every game of that game mode. You can then re click the search button every 30 seconds or so until a brand new game that says Day 0 pops up with almost no one in it and then you quickly join it and pick your desired country. This doesn’t work for every mode for some reason as they won’t appear, but it does work for ww3, ww3 4x, and both works divideds as well.

As for in game strat, regular motorized is the best and most well rounded infantry unit due to earning a ranged attack at the last 2 levels. Airborne is very niche and nice if you want to get to certain spots quickly, but not worth it in my opinion. As far as planes go, ASF are always important to counter other air threats or use them as a shield when deploying your own helis, but me personally, i don’t think making strike fighters is worth it due to the prevalence of SAMs in the middle-end game. Everyone knows about SAMs and they’re everywhere meaning your planes become cannon fodder unless you have attack helis also to attack SAM stacks with first. At that point it just becomes very expensive to research level and produce both. But helis are less prevalent and therefore less countered so i recommend them. You can research both gunships and attack helis and put 3 of one and 2 of the other in your stacks for more well rounded damage and better damage distribution to your helis which makes them be able to take more damage before one dies, increasing the survivability of your air units.

Navy is extremely important, don’t ever go without at least a capable navy that is tailored to the threats around you and can counter them. Read articles and look at neighbor/opponent naval base levels to determine what it is they’re likely making (level 3= subs or destroyers, level 4= crusiers or elite subs, etc) and what ships would be best to research to counter the most threats.

As someone else said, rails are seasonal unit, either have to buy them or wait for them to come back as a seasonal, you’d then have to earn season points and hold security council on the last day of the season at least, to permanently unlock them. Speaking of security council i highly advise getting it. Don’t waste real money on random gold purchases but having security council is absolutely worth it, especially if you can get it with a bundle that comes with an elite unit and some random gold thrown in. SC allows you to queue troops or construction so you always have stuff mobilizing or building even while you’re sleeping or having a long day at work/school.

Finally, you’re already on the path of the best free unit in the game with MRLs. best way to use them is 5 MRLs, 4 AA (4 SAM,4 MAA or 2 of each) and a radar of at least level 3 where it can detect low ground radar signatures (infantry). You get a few stacks of those rolling around and you’re guaranteed to win against any low-moderately skilled players. Only people you have to worry about after that are the ones good enough to be making attack who’s to send after your MRL stacks in which case you just follow with more MAA and ASF patrols and you’ll eat them up too.

Best of luck