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Use World#setBlockState to replace the IBlockState at the specified BlockPos with another. Use World#setBlockToAir to replace the IBlockState at the specified BlockPos with air (this just calls World#setBlockState). Use Block#getDefaultState to get the default IBlockState of a Block and IBlockState#withProperty to get an IBlockState with the IProperty set to the specified value. Forge has an introduction to block states here. You can call World#sendBlockBreakProgress to render the block breaking cracks on a block. If called from the logical client, it will update the break progress for that position. If called from the logical server, it will send a packet to all players within 32 blocks of the position (except the one whose entity ID was passed as the first argument) that calls the same method on their client.

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