Meeting other fans
  Seeing as you have internet access, you might as well use the web as a tool to search out fellow otaku. Most major forums, such as Anime Europe and the now-defunct Anime England, have an area where people discuss upcoming events from national conventions to three guys meeting up in a pub.
  You could also ask around on the forums to see if anyone knows of a club near you, such as LANMA in Leicester or The London Anime Club. LAC also have an open day where non-members are welcome, on the first Sunday of the month (Except in January), that usually sees three-figure attendence, and is a great day out. Check with your nearest University, as many of them have anime societies, and ask at whichever local shop you buy your stuff from if they're aware of one.
  Even if there isn't a club nearby, it's well worth checking if there are enough interested people in your neck of the woods to justify starting one, even if it's nothing more than going round someone's house to watch a few DVDs.

Conventions
  If you get enough otaku into one place, you kind of have a convention automatically. Anime fans seem to have this whole critical mass thing going on. If you want to absolutely immerse yourself in anime fandom, then this is the way to do it. Again, check the forums for upcoming events, but be warned - conventions normally fill up completely months before they're due to run, so get in as early as possible.

Cosplay
  Most often seen at conventions, but also at LAC open days and club days out, are cosplayers - fans dressed up as a favourite character. For many people, the enjoyment seems to come from making the outfit as accurate as possible, either for the fun of it, or for the cosplay masquerades (displays & competitions) held at conventions.
  As a side benefit, many cosplayers seem to take a certain sadistic pleasure in weirding out "normal" people by descending en masse on the nearest McDonalds etc to the convention site. If you can't find the concept of the cast of Trigun stood in a queue to order Happy Meals amusing, then you're probably in the wrong hobby.
  If you want to learn more about cosplay, I'd suggest that you check out Cosplay UK.

Other Things About Fandom
  Anime Music Videos
  Going to Your First Convention
  Otaku Stereotypes
  The Seven Ages of Otaku