You need to buy a ring and bracelet when you are engaged. You should give the woman's next of kin a small gift, not many gifts. It seems that a few hundred dollars is enough, depending on the economic strength. Both sides can discuss it.

When you get married, you should buy all necklaces, earrings, etc. When I got married, the gift money was much more, tens of thousands. When my brother got married the year before last, it was 35 thousand (including bridge crossing fee, bathing fee, assembly fee, etc. I don't know now, but the exact amount depends on the economic ability and the result of negotiation between the two sides.

Ask your girlfriend, or directly ask your girlfriend's sister's husband, which is more clear.

Also, when you are engaged to get married, you should bring something specific (I find it difficult to understand), which is easier to ask. If you are in the countryside, it is quite trivial.