I can't really help with cheats, but I can offer tips (though there might be a couple repeats).
If you started out in Wimborn (like most are apt to do) the best way to get money (in my opinion) is to get a slave with high beauty and make them commoner or higher (starting slave is a good choice, since you can give them the Natural Beauty trait, and they get the grateful trait eventually, allowing you to get them to Noble for higher stats without needing to worry about luxury., Maple is a good choice as well for it, when you get her), and set them as a public entertainer. It's probably not the best paying job, I'm sure brothel/sex related ones pay more, but it's pretty easy to get a slave started in it, and it doesn't have any potential downsides, nor does it seem to cause undue stress. I generally have 1-2 doing that, and I never really need money. Keeping a slave one cleaning and another on cooking helps as well, so you don't need to worry about food, and the mansion is always clean.
For quests, it's not too hard, find the slaves you need as quickly as you can, the Human at the beginning is the only one with a slightly annoying requirement: 40 Beauty. Other than that one, you can just grab the first one you see and use them. Grab a slime and a demon as you can, the fluid substance and tainted essence are a bit tough to come-by and they are produced during sex with said races.
A tip for keeping slaves from running is to buy one pair of handcuffs for every slave you can't keep in jail. It's 100% no running away with a small stress penalty (in the beginning, they get a little stressed trying to do things with handcuffs on) that also raises obedience a bit per day. I personally only have one pair, but I take them off whenever they become accustomed to servitude, since then I just need to interact with them to keep obedience up while they start to like me. (I'm a nice guy, so none of my slaves are scared of me, my usual routine in the interactions for ones that aren't in love with me is 'Chat x 4', 'Comb Hair x 3', Hug x 3'. This gives a good amount of mood and no fear or stress, leading to love, rather than fear, and love, as far as I can tell, is quite good at keeping them in line. I never really need to do anything else with them once I get them to the point of love.
Finally, as I said in my post about racial stats, Wolves seem to be best for melee combat, not great for magic, but I usually don't use magic anyway. A wolf with 6 strength and a longsword has 37 power, whilea dragonkin, with it's natural +2 strength still ends up with 6 strength, and has 33 power. I can't really help with magic combat, but I'll give a quote from someone else.
Corruptedturtle: "As of last version however, I think fairy/drow with 6 ma, +tattoo, can pretty much 1 hit kill everything in the game with acid spit (except super golem and wyrm, even so will take more than half its health)"
To upgrade stats, you have 2 options. 1) use gear that boosts it at the end of the day, or 2) use learning points. Learn points are easy to get, the best way I found is to switch to garden first while interacting with the slave (which adds a few 'turns' to the interaction, and then just spam the teach command. The garden, on occasion, lowers stress, meaning you get less stress from the teaching process. Do that until they're close to the top of the stress bar, but don't actually get to the top, then let them rest a few days to lower stress, preferably while doing the same process to other slaves. After all, max stats make all jobs more effective, since you can't do better than having the best stats for the job.
And that's about it from me for now.