I'm sure you already recognized that working with shortcuts in ABAP in Eclipse is much more efficient than using the mouse. The basic shortcuts that you need to start your development in eclipse are already described in the getting started document:
http://scn.sap.com/docs/DOC-29294
Also the Eclipse quick reference card for the shortcuts is very helpful for beginners:
https://blogs.sap.com/2012/07/02/adt-quick-reference-card/
But there are a lot more useful shortcuts available that might help you in some situations:
Editing source code:
Shortcut
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What it will do
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CTRL+D
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Deletes the selected codeline
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Navigation:
CTRL-L
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Jump to line in editor
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Editor Tabs:
CTRL + E
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Displays a list of all open editors
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Debugging:
CTRL+SHIFT+B
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Set a line break point in the ABAP editor
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In case you need a complete list of all available shortcuts you can use the shortcut CTRL-SHIFT-L in eclipse that opens a small window with a detailed list. Hope there are some interesting shortcuts in the list for you.
Have fun,
Thomas.