You really should consider purchasing the factory CD-ROM manual for the 107 series. While not perfect, it will answer most questions for you and in many cases may prevent you from attempting a job larger than your resources of knowledge or tools.
The systems you expressed interest in are covered by dozens of individual diagnosis and repair jobs, which show schematics and wiring diagrams as well as critical tools, in the manual.
The Dealer should be ale to get the 107 series CD-ROM for you or you can order direct from MB via their 800-ask-mercedes phone line. Another possibility is used copies of factory manuals via books4cars.com or another of the used book vendors.
Good hunting,
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