Raw is usually more expensive but worth it IMO. If you get good at sourcing suppliers and stocking up, it can work out about the same or cheaper than a high end kibble.
I would not mix the kibble and raw (they are digested differently), but go cold turkey (ha!) onto raw.
Most important thing is to balance it properly.
50% muscle meat
45% raw meaty bone
5% organ meat
Most people start with chicken, and don't feed organ meat for the first week or two, then gradually add it in. Then start giving your dog more variety, add beef or turkey, fish etc.
Lots of info here on what to feed and how much to feed.
Welcome to the Raw Dog Ranch
Dogs have no nutritional need for carbs, and kibble is packed full of it, as they need something starchy to bind the kibble together during extrusion process. One of the biggest culprits for causing diabetes and obesity in dogs too.
Another big thing is be clean about how you handle the meat. I feed my dog in a crate and wipe the tray with Lysol wipes, wash bowls after each feeding and wipe counters.
You can also get started with a commercially prepared raw diet (it's more expensive though, but I also find it a good way to help your dog change over to raw as the bone is ground. I found my dog's stomach acid needed a couple of weeks of raw feeding to get more acidic, kibble lowers the pH, before she digested bone properly. So having the bone ground was helpful) and start to change over to whole raw. Pretty much everyone I've convinced to try raw has never gone back to kibble, they've been so pleased.