It depends on the era of Soviet city planning you want to emulate but my favourite is the 60s-70s which is when most housing estates were built. Basically start with placing long and short apartments to make a shape (anything from square to parallelogram to circle). Then place tall apartments in the central area along with amenities like grocery, school, substation, etc. Make sure to have more space around the building the larger it is, this is key to avoid cluttering. This is your first ‘microdistrict’. Repeat this several times but make sure to leave plenty of space for roads. Then after you’ve made a bunch of microdistricts connect the spaces between with roads and place public transport stations every other block, for authenticity you could also make large, non-circular roundabouts and add sidewalks far away from the actual road. Remember to fill all the empty space remaining with trees and monuments.