depending how many risks you are willing to take.
dark elf or fairy for the magic attack stat + apprentice class for master > custom slave - side with workers guild go with a human + worker class + high phys with tmd and tam, stack the equipment on them travel to a village with wood cotton food , sit there farming wood and cotton, usually check slavers guild, buy a few other slaves with worker class or blank if not avaliable and spread them out accross resouces. that's pretty much an easy foundation to work off since buy about the 2nd or 3rd day can be upgrading the mansion to have room for another 5 slaves. daisy is a safe pick up usually go farmer class and then into pure social classes afterwards
Other way i will do it is worry about the 1st payment and the 2nd payment so about 4k total and just rush faction quest on medium or hard quests, make sure to get meat soups for the healer class and just rely on fish and wood for resources where possible can be through becoming mayor quest before end of 3 payment, from there smooth sailing. i do recommend going either archer or rouge on the master, siding with either mages or fighter guild and having a peon scholar for the custom slave for the heals. just recommend getting peons with the figher, rouge, or scholar class, and just rush a caster and healer, druids are a plus same with fairy because of the innate healing skill per day.
with the start of the civil war quests usually spend a bit of time building up gear and stats since no pressure of time constraints. dragonkin and seraphs are worth while if you see them at the exotic slave trader. And start moving resource production into the mansion.
usually have both questlines done by about day 60 give or take.
usual build for fairy - apprentice > druid > rouge > archer > scholar > caster > theif > necromancer
if fairy or mage just leave them on fishing there's no real need for them to be taken off of fishing.
social slaves just rush dancer and watchdog all you really need and have a class on them for gathering materials get more use out of them. one dancer per resource village - leather collars and maid outfits go along way with making it less micromanagement.
human slaves are prefered with worker outfit, respective tools and class for the job they're doing due to racial bonus.
master stat's i tend to do a 3 split on all and boost up physics charm and sexual just to bypass the lich fight, get the scene with aire and have options for the final bit with anastasia
worth taking zephyra to elven capital for the interaction there to save sacrificing someone .
daisy quest is usually done to the outfit for the bonus's and completed at end of game.
shop items - usually will buy up axes and sicles when i see them, weapon wise ancient/obsidian and draconic are worth buying just a minor financial setback but saves making gear in the long run. armour wise i usually tend to just use what's rewarded in quests and loot in dungeons.
there's no real incentive to stress over getting the classes in the faction shops they're not worth while or worring about they're just an after thought don't need them to beat game. blood mage and healer is a nice combo with mass heal and using health to restore manor.
with just melee and archer slaves i will usually stick scholar on them for a back up healer to keep the main one's alive.