Try my brewery tap for one of the biggest selection of real ale micro brewerys in the UK plus some awesome US beers.
Their selection box is a great place to start & they do a mighty fine 52 week beer club. Yes you have to pay shipping but their service is great & in the 18 months I’ve been using them I’ve yet to have a beer I don’t like.
I started getting in to IPA’s after trying Bengal Lancer and haven’t looked back since. Marble Brewery in Manchester do a great beer called Dobber which is similar to Bengal Lancer if a little more complex. I’m now on to the US Craft beers such as Odell, Stone, Anchor etc but still got a lot of love for the likes of Magic Rock, Thornbridge, Marble, Bristol, Darkstar etc
Sainsburys do a good selection but i always find Waitrose good for the smaller brewerys, especially local ones to you.
When out & about keep an eye open for Freehouses as they tend to have some different beers on rather than the usual stuff & when in there see if they have any copies of the CAMRA magazine (Drinker) as this will have loads of stuff going on local to you pub, brewery & festival wise.
If you can find a beer festival they can be a great place to try new beers from all over the UK plus no one will look at you funny if your drinking 1/3rd’s of a pint so you can try more.
The long & short is to get out there & try them. Yes you may get some you don’t like but that’s part of it.
Enjoy :P