I am considering switching to raw for Wookie

. He has been on a combination of Innova EVO (which we love!) and a homemade patty that I make with a mixture of things (lean beef, chicken, veggies, olive oil, apple pulp, herbs and about half long grain brown rice). Since he has been having problems with his pH being so alkaline I am thinking that I am not doing the best for him with my patties I make, although I have been told that what I am doing is good for him. (Even by my hollistic vet) That maybe things aren't balanced correctly in them. I am assuming if you buy pre made patties they will be correctly balanced and all that. The place that I buy from carries the Natures Variety raw medallions, which seems to be a very popular one, so I am thinking about it. But I have some questions I hope you guys can help me with (bare with me, there are several)
1- Is it ok to still feed the Innova? Like I do now, kibble in the morning and a patty in the evening? I really like this routine.
2- So are they really RAW? When I made his patties before, I would poach them in boiling water before I gave them to him. There is just something about 'raw' that scares me.

Could I do this with the raw patties too?
3- Does he need to be on any type of supplement? My hollistic vet recommends always having a supplement. He suggests Vim and Vigor.
4- Which one should I buy? Chicken, beef, venison, rabbit, so many choices!!!
5- Is this something I should make a gradual switch to, like any other time you switch foods? How would I go about that?
Sorry to throw so many out there, I just want to be informed. There is soooo much info online that it is really confusing and you can get so many different opinions (which I am sure I will here too). Any other info you guys can offer is appreciated too! Thanks guys!!!!