Early game is quite easy, but you need to understand the goal here - you don't want to win glory points, you want to limit Cassandra's glory gain by denying all cards that increase her work and you want to end battles quickly by losing your influence, so she can't use her daughter card many times. This way her wins become almost worthless, as her daughter card is her only source of glory you can't remove, once you downgrade this card by corrupting Tiffany it stops being a problem.
You also don't want to win and gain glory yourself - this only results in upgrades to her other cards which makes removing them more difficult.
Couple of early game priorities:
1. Increase max energy to 200 in the gym and upgrade your starting Work hard cards to 5/3 (business street).
2. Find few more Work hard cards in the newsroom (20 energy each) and maybe few Money hoarding (20 money each) in the ghetto.
3. Find few Rest cards in the gym, upgrade them to 15/50, then upgrade all work hard to 15/10 and money hoarding to 20/30.
4. Add few max upgraded Information gathering and Check your options.
5. Get some allies, I am using mostly newsroom girl for 0 cost on money hoarding, ghetto guy for that one Cassandra's work card that has to be removed by ally and red district girl for +2 cards effect.
At this point you have a very well working deck that you can use to finish battles with a nice amount of energy, money and blackmail left for the city phase which makes city turns a lot longer and at some point you have enough to keep Cassandra's glory in check and even start lowering it either by using blackmail random event or by Karen's random event in the newsroom that makes Cassandra's work start negative in battles which results in glory decrease at the end of the battle.
You also should have enough blackmail to end each city phase with a Cassandra or Tiffany visit once you use all the energy.
This is btw the most time you will spend in the game - with both your and her glory very low while losing battles on her 0 work and working on the events.
Once you unlock all of them you should have a lot of money and blackmail saved and you are ready to get some Generous cards and start going for 1k glory to end the game.