Here are a couple tips:
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If the cutting board is under 1/2" thick, you can place it on top of the crumb tray to engrave.
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If the cutting board is over 1/2" thick, you’ll have to remove the crumb tray, then prop the cutting board up on top of something (scrap wood for example) until it’s within 1/2" of the print head. You can cut out one of these rulers to help you do that without doing any math/measuring.
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Put the cutting board in the machine, close the lid. Go to your GF app, click the 3 dots icon in the toolbar, then click “Set Focus” in the menu that drops down. Now click somewhere on your cutting board. This will have the Glowforge go measure the height of the board so that it can show its size accurately on your computer screen. If you skip this, your engraving will not come out where you place it on your screen.
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I recommend 1000 speed, 100 power, 225 LPI. That should look pretty good with most designs on most wood or bamboo cutting boards.
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You don’t generally need to mask bamboo before engraving it. The surface is slick enough that you can wash off any charring around your engraving using a baby wipe or some soap and water.