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You have got all the answers right. the command is AT+CSCLK (configure slow clock) not AT+CSCLS.
Idle mode is simply the mode when your module is out of sleep mode(by force due to low DTR) while there is no data on serial port nor any other communication in progress.
Among the two antennas, one is for GPS and the other is for GSM. AGPS device downloads the orbital information of satellite from the servers (in your case probably SIMCOM's servers) using either gprs or wifi(in your case it will be gprs). So yes, you will have to connect both the antennas for...
Connect the module to your computer using RS232, (USB to RS232 bridge cable can be used), and send the AT commands. the module will reply OK. At first start up the module is at auto-baud, so any baud rate should be fine. Or you can try some common baud rates like 9600, 19200, 57600 etc...
Also...
For what connectivity ? you have connected the P0.14 to which point in the schematic.
Redraw the updated schematic and upload if you really want any help.
At BOOTUP LPC2148 polls P0.14(PIN 41). If the pin is low (grounded) the controller enters in boot-loader mode and accepts programming commands on UART0. If the pin is high, the controller jumps to the program (if any valid program is present in flash).
I cannot see any thing connected to P0.14...
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