How do I get to see Real Madrd play

[Thankyou4calling]

I want to take my brother and nephew to see a Real Madrid game at the Bernabeau next season once the fixtures are announced. If I picked a game against lowly opposition it seems that it they don't sell out. Can I buy tickets as a Brit on line, should I take my chances with touts at the ground? Does anybody have any experience of this. I guess I could book a package but I'd ideally like a cheap flight out, watch the game, night in a three star and return the next day.