Jewellery samples done.. making my first bulk order. Do I buy a lot of stock or not too much?

Title says it all.

Got some custom-made jewellery made with my brand logo engraved etc. Have about 10 different styles. Going to make a bulk order in the next few days/weeks, but wasn't sure how "bulk" I should make this order. Naturally, I've no solid clue how my bracelets will sell etc. I'm thining about ordering about 100 in total, thoughts on this? My supplier is in China.