Go here to learn BASIC Meditation Techniques

I recommend these classes as an introduction to basic meditation ONLY.
Once you have learned basic techniques, seek out the most senior and highly respected monastic you can find to continue to practice with. Ie. Stick with the winners
There are many classes and groups available and I will mention them in another post.

http://www.fwbo.org/

http://www.lbc.org.uk/