Hello, liz49! Welcome back, fellow Ohioan!!
When you buy tickets online via Renfe.es you'll have the opportunity at the end of the transaction to print your tickets. If I were you, when you get to that screen, SAVE PAGE AS - to your computer. It'll be a PDF file - and don't worry if the bar code is jumbled.
Before attempting to buy tickets on Renfe.es you'll first have to register. Within that registration you'll be asked to enter and validate your credit card. You'll find a number of threads about this process in this Transportation category of the message board. Some credit cards work and some don't.
Liz, if you have any trouble, let me know. At least for train tickets, they don't carry a name and so anyone can buy them for anyone else. I could potentially buy the tickets for you, send you the tickets via email, and you could pay me back. I'm already registered at Renfe.es.
Also on Movelia.es, you'll be able to print your tickets from your online purchase.
Saludos, MadridMan
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