I have almost convinced myself I will regret asking this question

I have done a search and can find no answer, perhaps I am not asking the right question.

As you know I have spent a good time updating my old website to what I have now, I tried to view it on my tablet and could not see it.

How do I make my website compatible with mobile and tablet devices.

Please tell me it is an a one click option in WD7...... Oh hang on let me just come down from planet zog to reality.

I am sure someone is going to say.... Sorry mate you have to upgrade and start from scratch.

If you could just give me a few pointers where to begin I would very much appreciate it.

Regards,
Den