This German accent guide shows you step by step how to do a German accent and has videos of people speaking in a German accent. I honestly think the best way to learn is to watch people speaking it,...
The use of German words for like is somewhat different to English:
Ich leibe dich = I love you where liebe is pronounced leeber
Ich trinke gern Kaffee = I like to drink coffee where gern is...
There is no single word that can encapture the "British accent" since there are many dialects. Possible answers range from pompous to uneducated and fill the entire spectrum therein.