Are there instructions anywhere on how to run a testnet validator? install.sh seems to default to mainnet and idk how to change that

Also, what port is used by default by a full node to peer to other nodes?

wget https://raw.githubusercontent.com/ton-blockchain/mytonctrl/master/scripts/install.sh

bash install.sh -m full -c https://ton-blockchain.github.io/testnet-global.config.json