Best Textbook for Teaching English to Spanish Students/onestopenglish???

Hi There,

I am going to start giving lessons at beginner's level and I was wondering if anyone could give me some advice on the best system to follow.

At the moment I have that That's English coursebook series (without tapes)...

Can anyone please give me any recommendations.

Also, is the subscription at onestopenglish.com worth it? I've had a look and its around €50. Is it worth looking into?

Thanks in advance,