Hi & welcome,
The first advice I will give is to do your research. Posting on here is a start but I advise that you read some online material so as to become more informed. I say this because your indicate you may have limited knowledge on the subject.
The second piece of advice is that you need to be satisfied that feeding raw is appropriate to you, your dogs & your household. You can get bacteria on your hands when preparing a joint for a sunday roast, however, do give proper consideration to sensible hygiene, ( human babies should be kept away from dog bowls & unwashed dog mouths immediately after feeding).
You may find the following links worth reading properly.....https://www.allaboutdogfood.co.uk/articles/raw-feeding-101.phphttp://www.thelabradorsite.com/raw-feeding-for-dogs/https://www.cotswoldraw.com/faqshttp://www.wolftucker.co.uk/raw-advice/http://www.nutriment.co/why-feed-raw/http://www.paleoridgeraw.uk/raw-faqs.htmlhttps://benyfitnatural.co.uk/pages/faqs
The first link is to an article on this website, the second is from a breed related website (although advice is not breed specific). The other links are to raw faq pages from a selection of manufacturers. i have provided links to their Faq pages as they provide answers to common questions posed by those considering changing to a raw diet.
You should be aware that the commercial links are to companies that sell raw complete Barf. Basically easy to feed products where the products should be all you need (unless you specifically want or need to add supplements). Using the commercial links you will be able to navigate to online shops & elsewhere to get a better idea of variety & price.
I mentioned that the commercial links are to those that sell Barf raw complete minces. You should also be aware that there are other ways to feed raw. Some feed minces that do not contain vegetables, some chose to make up their own raw based meals putting together specific ratios of meat, bone, muscle, organ meat offal etc. There are various suppliers that cater for the diy raw feeder. In the extreme some feed prey or whole prey....certainly not for the faint hearted.
You may find the commercial inks useful. Do bear in mind other manufacturers are out there. You can use this website to find reviews & more links to other manufacturers. Shipping or collection cost may be an issue depending on where you live etc.....Your choice may be down to what is available within an acceptable travel distance for collection. Swapping from one decent brand to another will typically be less hassle than changing kibbles of varying quality.
If using mail order do try to deal direct with suppliers who use couriers that understand the product being delivered. You ideally want to be at home when food arrives......a case of raw food defrosting in the sun all day is not good..
Reckon on around 2% of bodyweight (300g per day) as a start point. To kick off you will probably introduce smaller feeds until your dog gets used to new food. As with any new food you need to stick with it for a few days or weeks. Do not expect an instant calm transition as dog & gut adjusts.
One bit of advice....Do not be tempted to go to nearest leading national pet food supplier, there can be better choices or decent raw complete minces from independent shops or dealing direct with manufacturers.
Please read my post & links properly & then get back if you have more q's.
Hope this helps.