I need to know when exactly is this supposed to start, game-wise - January 1st 1919 (no Versailles yet, Hungary still fighting neighbours, Germany on the brink of Spartakist rebellion) or June 28th (Versailles signed). Both dates have their merits - January 1st is more interesting, IMHO, and its easier to find information on the "beginning of the year" then on the middle of it, but June 28th is generally less confusing.
Now on ze Russian situation. In January 1st, Germans are still occupying Courland, but governments in Estonia and Lithuania, albeit threatened by a Red counteroffensive, and a more stable Finnish government are already established. Poland seeks to expand east, at the expense of Ukraine (with which it is at war) and Russia. Ukraine "controls" much of its modern territory plus some more, but minus Crimea. Problematically, Ukraine is divided as well - the Directory dominates Eastern Ukraine from Kiev, whilst the Western Ukrainean National Republic (based in Stanislav/Ivan-Frankivsk) is taking the brunt of the Polish offensive. Both are ideologically the same (right-wing populist, anti-socialist, very nationalist), and thus negotiations are already on about unification. Symon Petlyura wields not much official power, though he is in the government, but de facto he is the one in charge in the east. For game purposes, I think both Ukraines should be considered united from the start rather then from January 22nd as in OTL. Another problem is that Ukraine doesn't have much of an army, whilst at the same being partially-occupied by Whites and partially by Reds. Also there are the Greens (anarchists. Go figure...), not sure what to do with them - probably either a separate faction, or just a rebellion. Belarus is de jure independant as a Soviet Socialist Republic, but de facto its under Red control - and Poland is eying it as well.
Georgia, Armenia and Aizerbadjan are independant from the start, most notably Armenia also controls Kars and in OTL it succesfully fought back invading Turks, Azeris and Georgians. HAYSTAN UBER ALLES!
Central Asia - anarchy, warlords, basmachis.
Interventionists - Britain occupies Baku, Murmansk and Arkhangelsk, Japan occupies Vladivostock, and indeed much of Far East, though there are many problems with that... French forces are in Sevastopol and Odessa, to help... somebody. Probably Whites, but maybe Ukraineans (in OTL, they eventually left, confused, without firing a shot).
Reds are fairly centralized, led from Petrograd by the VKP(b). They actually only control much of modern western European Russia, plus Belarus, plus chunks of Latvia and Estonia. They control the Volga, but slightly to the east from there Kolchak's faction of the Whites is located; it nominally controls all of Siberia and the Urals, though its rule is shaky and unpopular (hence a partisan war all over the region). Far East is Japanese-occupied, but Semenov's clique (not White, but still anti-Bolshevik) is also important. Also, the Military Buddhists are on the verge of appearing... Finally, Denikin commands White Forces in the south; they control northern Caucasus, Crimea, much of the Don River and large chunks of Ukraine that de jure is under the Directory.
By June 28th, situation in Russia is somewhat changed. Poland is on the march eastwards, taking Vilnus and Lvov. Estonia (which housed a White army of Yudenich) and Lithuania are more stabilized, as is (still German-occupied?) Latvia. An Entante puppet government in Arkhangelsk has appeared, under Chaykovsky. Red forces are advancing southwards, having taken Kiev. Petlyura is desperately trying to fight back Reds, Whites and Poles alike in western Ukraine, whilst Denikin is preparing an offensive towards Moscow (in coordination with Yudenich in Estonia, who plans to attack Petrograd). Kolchak is being routed badly, having recently lost his main base in Ufa. His army, harassed by partisans, is retreating towards Irkutsk with many casualties, and a break between left-wing and right-wing whites is beginning.
One more thing - on both dates, Hungary is still fighting all of its neighbours and holding on to numerous territories it lost in OTL. Ofcourse, the conditions change...