Similar to Ethereum and other networks, Moonbeam network requires $GLMR token in order to do transactions on the network. You can obtain $GLMR from the Solarflare's gasless swap, or you can obtain them from supported exchanges.
Moonbeam Network Settings
You can manually configure your wallet, by adding Moonbeam network with the following settings:
Network Name: Moonbeam
Network RPC URL: https://rpc.api.moonbeam.network
Chain ID: 1284
Currency Symbol: GLMR
Block Explorer URL: https://blockscout.moonbeam.network/
Configuring Wallet in Metamask
Step 2. Adding Moonbeam Network
After you've opened the Network tab, scroll down and click "Custom RPC"
Step 3. Fill in the details
Fill in the details with the Moonbeam settings (at the top of this page).