I bought a rail pass from the travel agen today. Now I'm planning my train schedule. I'll be Granada for 3 days and then off to Valencia. I checked www.renfe.com and there's 2 trains ( TRENHOTEL and Garcia Lorca) leaving on that day. Do I have to make train reservations beforehand to make sure I have spot? If so, how long in advance should I reserve?

Thanks in advance.