Buy Serey Coins
SouthXchange is a South America cryptocurrency exchange with a good security reputation. You can sign up on SouthXchange and buy Serey Coins without KYC.
STEX.com is a European based cryptocurrency exchange. You can sign up and buy Serey Coins here. They have a strict KYC and volume might be lower than SouthXchange.
Buy Serey Coins on Serey Wallet
You can buy Serey Coins directly with BCH. Create a BCH address, then deposit some BCH and convert it to Serey Coins directly. To do this install the Serey Wallet now.