To get started with MRS, you need index some matrix servers first. As a good starting point, you may use The-Federation.info public API to get the first servers.
curl 'https://the-federation.info/v1/graphql' \
-X POST \
-H 'content-type: application/json' \
--data '{
"query":"query MatrixServers { thefederation_node( where: {blocked: {_eq: false}, thefederation_platform: {id: {_eq: 41}}} order_by: {last_success: desc} ) { host }}",
"variables":null,
"operationName":"MatrixServers"
}' | jq -r '.data.thefederation_node[] | "- " + .host'