Well now. 'BDSM' is a very broad scope. As a PP said, he could mean some pink marabou handcuffs and a bit of spanky spanky, or he could be into a 24/7 Master/sub lifestyle where he trains someone in service. Plus there are all the sub kinks that link in to BDSM - electro stim, med fet, furries.
You need more information, so you need him to be open and honest about what HE thinks BDSM means, what he's into, whether he's Dom/sub/switch, whether he has any particular kinks or fetishes. Then you need to decide if you are comfortable with his answers.
The big red flag will be if he's reticent about answering. One thing any BDSM-leaning relationship needs to be is excruciatingly open and honest. I appreciate that this is a fledgling connection but if he's not prepared to be open with you now, I would advise against placing any kind of trust in him with regards to restraint or sensation and pain play.
DP and I are Dom/sub (he's my Dom). Stuff we get up to: restraint (leather cuffs, spreader bars, collars, shibari) sensation and pain play - so temperature play with ice/hot wax, whartenberg pinwheels, vampire gloves, paddles, floggers, bare palms. Electro stim - we use a tens machine. Fetish piercing - he uses sterile hypodermics and ribbons to create zips and corset ties on my skin. We also have regular lovely vanilla sex sometimes 😉. The absolute key is trust. I trust him 100%. I know that if I need him to stop he will. I'm very clear about pain I enjoy and pain that is too much and whilst he'll take me to that line, he will never force me over it against my will.
If it's something you are willing to experiment with, and you can trust him, and he's decent and genuine, it is something that can create an incredible bond. If you decide it's not for you, you need to ask him to be honest about whether it's something he can live without.
You always, ALWAYS need a safe word.