Set your motor up with a MOTOR elevation (the LATITUDE scale on the motor bracket) of a hair over 39. The DISH elevation (elevation of the dish itself) should be about 24 degrees, but bear in mind that the elevation scale on this dish can sometimes be off by as much as 5 degrees, so you will have to tweak this a bit. Once you set the motor elevation (on the motor bracket marked LATITUDE), tighten that up and don't touch it again (tweak dish elevation only).
DiSEqC switch should go between the LNBF and the motor, so most likely that will go outside. While you're aiming your dish, first use a direct cable from the LNBF to your receiver. Hook it to an 'L' output on the LNBF. Keep the switches out of the equation until you're sure the dish is aimed and peaked, that makes things simpler.
To run two receivers, you will have to use two DiSEqC switches, one on each receiver. Only one switch output will be connected to the motor, the output on the other switch will go directly to the secondary receiver. Only the primary receiver (the one connected to the motor) will be able to control the motor. For a DiSEqC switch, I'd put linear ('L') on port 1 and circular ('C') on port two. No need to terminate unused ports with a terminator, just use an 'F' connector with some silicone in it to prevent moisture from entering (you're not trying to electronically terminate anything, just keeping weather out).
Personally, I'd use a 22k 4 x 4 multiswitch with the Invacom Quad instead of two DiSEqC switches. Many reasons for this... the multiswitches are usually of better quality, and they give you the option for up to four receivers to be connected. If you decide to do this, grab a 4 x 4 multiswitch and connect the two '22k off' ports of the multiswitch to the two 'L' outputs of the Invacom. Connect the two '22k on' ports to the two 'C' outputs of the Invacom. Connect one of the four outputs of the multiswitch to the motor, and connect the motor to your primary receiver (the one that will control the dish). Connect any of the remaining three outputs of the multiswitch to additional receivers.
Hope this helps...