I Have Some Issues Flight Planning. Please Help.

Regarding the speed issue.
That happens when you pass 28000 feet and your auto throttle shifts from IAS (indicated airspeed) to Mach speed. This is for multiple reasons, mainly because the airspeed will start dropping once that option is selected but your ground speed will remain the same. A typical single aisle airliner might cruise at around M0.75-0.80. Larger planes could reach M0.85. For that, and the flight planning, I suggest you use SimBrief. Here is a nice topic Chris made:

Also, Brandon Sandstorm made a 4-part series about flight planning in global:

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