Used ES 335 String Buzz

I have just bought my first real instrument which has been a great inspiration and huge help in reducing my occasional frustrations. It is an ES 335 dot 2005 but has some buzzing in the larger diameter strings and a sometimes dead sound from the lower frets on the lighter gauge strings.
Any suggestions as to what set up process I need to follow.

Thanks,

R.J. Dreamer

I would suggest you to go and see any pro set up guys or technicians who can help you to set up in a proper way rather than doing it yourself.