should I just play the games, and then if glitches occur, then look at possibly resurfacing?
Yep. Scratched CDs aren't much of an issue on the Turbo.
1) TGCD's didn't use stupid proprietary cases that were thrown away like the 3DO and Sega CD.
2) The CD-ROM was expensive enough that little kids didn't got their hands on it.
3) Turbo games were unpopular enough that they were never circulated by the Funcoland shredder and mainstream secondary markets.
I don't worry too much about condition when I buy used games and out of approximately 150 TG/PCE CDs purchased over the last fifteen years, I've only encountered problems with scratches on one (1) game. If you do get a scratched game, get it professionally resurfaced.
I know that these CD games are not getting any younger,
People keep saying this and it's nonsense: adult-owned CD's will last 'till you're dead. Don't fumble them. Keep them in cases and at room temperature. Don't store them in the living room if you live with alcoholics. The only thing that could wrong is if they get covered in dust and then exposed to so much moisture that mold grows on them.
I'm just planning on trying to get Rondo X, and I just want to protect my $70-100 investment.
Video games aren't an investment.
Or maybe I should copy the CD and then play the copy?
There's a lot of controversy on this and we've had countless discussions. I'm in the "CD-R's-will-ruin-your-lens" camp. Do some searches and do what you think is best.