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There’s a few different ways to build and run Besu https://besu.hyperledger.org/public-networks/get-started/install
since The Merge, you need to run besu with a CL - see https://besu.hyperledger.org/public-networks/tutorials/besu-teku-mainnet - checkpoint sync is pretty quick
Note that doing a full sync will take days and take up TB of disk space. Checkpoint is a good option if testing locally. Some info on resource requirements https://besu.hyperledger.org/public-networks/get-started/system-requirements
Ready to contribute? Yay!