It would be a very bad idea to mention the raw food diet right at the start. She would automatically assume that you're obsessed by it. In short, view yourself simply as an average man who just happens to eat a raw food diet, rather than as a raw foodist, and mention it in passing after you're more advanced into the relationship or if she asks directly. You should also sometimes compromise as regards eating out. This is necessary for single RAFers, IMO. The only ones I know who can be 100% raw tend to be already married(in which case the other partner is also a RAFer).
Eating raw fish at sashimi restaurants is a great idea as is eating raw oysters at oyster bars(they're usually smoked, I think, though?), you can also get raw steak tartare in french/hungarian/russian restaurants(just ask them to leave out the butter) and there's even raw meat kitfo in Ethiopian restaurants. The steak tartare option is good if she hates all raw animal food(most don't mind sashimi at all), as that means you can still eat raw without there being any disagreement. Raw vegan restaurants are also an option unless you go zero-carb. A cooked alternative would be all these semi-organic grassfed burger joints that are appearing all over the place(just ask them to not add any extras like mayonnaise etc. to the burger). And then there are those restaurants serving wild game, albeit cooked.
Re alcohol:- You can get away with that up to a point. First of all, "real ale" also known as "cask-conditioned ale"/"cask-brewed ale") is actually raw/unpasteurised and full of bacteria and a better option than lager with all its chemicals. Also, German and Czech beers are forced by their governments to only have 4 standard beer ingredients so, even though they're pasteurised, they're not full of chemicals. Then there's spirits. Transparent-coloured spirits don't have the kind of hangover-causing congeners that exist in coloured spirits, meaning they have less of a toxic effect on you. Of course, when going to bars/pubs you have little choice except lager or spirits so choose some transparent spirit like vodka as a compromise(mineral-water , otherwise), and buy things like real ale bottles for your home in case of guests/dates.
My own view is that it's OK to have 1 main sin. I avoid cooked food as much as possible unless a disaster strikes, preferring raw organic fruit if raw meats are unavailable, but I'll settle for occasionally drinking some alcohol with others.
*I really need to do a thread/post on how to compromise re raw foods. I'll do a preliminary post at some stage and then ask people to add their own suggestions.