Welcome to the site !
The best thing to do would be to search through the diet and nutrition forums to find out the sort of diet you should be following, and also the training forums for workout.
First, read this:
http://www.musclechat.co.uk/viewtopi...136&highlight=
10 fundamental ways to gain muscle mass.
Then, read this:
http://www.musclechat.co.uk/viewtopic.php?t=4308
An excellent diet thread written by young gun
A workout that you might want to follow is the beginner's guide by Garry, he wrote it a long time ago and has proved effective for many people:
http://www.musclechat.co.uk/viewtopic.php?t=1983