Just be frank, and ask. They’re not going to think “Oh look at this kid talking about money already. Screw him let’s hire someone else”. They might say “We’re still working out the details”. You can follow-up by asking “well can you give me a ball-park range, as it would help me plan my relocation?”. Never be shy when it comes to compensation. It’s a tricky issue, sure, but if you can’t talk about it, odds are you don’t know how much you’re worth. Always know your worth. Be it $20k/year, or $500k/year.