My two came from the shelter last summer on a mixture of dried and "any wet food in jelly", and I introduced them to a partial raw diet - they share a pouch of food in the morning and have a raw meal in the evening, with biscuits down all the time (except if they're being fussy with the raw when I confiscate the biscuits till they've at least had some of their meal!).
I did a lot of googling beforehand and there are many websites out there with different advice and guidelines. I found other forums like this one useful too so I could read other peoples' stories and questions. There seem to be a couple of different "styles" of feeding, ranging from people who effectively make their own minced-up raw cat food to people who feed mainly whole prey items or big chunks of meat and bone, and "frankenprey" which is trying to overall recreate a cat's natural prey animal in a hodge-podge of meals across the week. I didn't fancy the mincing option myself, because a) lot of prep and b) it seems to remove a lot of the chewing and gnawing benefits that giving chunks of food brings. I also haven't plucked up the courage to try giving the boys something like a feeder mouse or half a skin-on rabbit for the "full prey experience", but I might still get there one day.
When I started as I recall the first thing I did was buy some chicken wings and I just plonked one down on a plate for them. While they were somewhat interested, unsurprisingly they didn't just leap in and start gnawing away - I don't think they understood it was food. Since they'd mostly had cooked bite-size meat in jelly from a pouch, I'm not surprised! I then dialled it back a bit and tried giving them some bite-size pieces of raw chicken breast, which they liked. From there I moved on to chicken legs with most of the meat cut off in chunks, but gave the bone too - the first time Rolo carried the leg-bone off and started crunching it my heart was in my mouth because I thought he'd break his teeth or choke on a splinter, but he was perfectly happy! He's very good with bones while Monty is less thorough, but only the knobbly ends are left after they have chicken legs now.
Thighs or big leg portions are the main chicken source I use, and wings and ribs don't have much meat on but are good for crunching and providing edible bone. The boys also have beef and lamb meat occasionally - whatever is fairly cheap in terms of things like stewing steak, sometimes mince though I don't like to give that too often. I tried them on raw fish a couple of times but they weren't keen - they have tinned sardines sometimes, and egg yolks as a treat (they shouldn't have the white raw - only cooked).
The offal component of a raw diet is important as well - I don't get too hung up on the proportions as the raw is only maybe a third or so of my boys' diet, but for a full raw diet the recommendation seems to be matching the proportions of prey species in terms of meat-edible bone-organs. Heart doesn't count as organ since it's just made of muscle - the organ proportion needs to come from secreting organs like kidney and liver (often the liver proportion is given separately as regardless of what else they eat they have to have some liver). But heart is useful to give as some of the muscle meat since it has high levels of taurine. Where I live you can get chicken hearts cheap from the butchers in the Bangladeshi part of town, but even the small Tesco near me sells lamb heart - as well as several types of liver. Asda has lamb kidneys. I've tried asking a local butcher about sweetbreads and he said he could order me some in so may try that soon. My pair can be a bit fussy with the offal sometimes, Monty will usually eat the liver but Rolo often avoids it, but we persevere - I tried cooking some chicken livers recently and he had some of that, so he will cooperate sometimes!
Good luck if you decide to give it a try. I'd suggest starting small and taking it a day at a time - it doesn't have to be an all-or-nothing experience.