if you get tired then you can pause the game have a rest then play on:
these are the ways i learned to pause: by click the home icon then dont click anything your game should be paused and you get a choice to go to the wii menu, reset game or continue(for continue click close) or on most games the + button pause's it
you can connect your wii by using cables i beleive but like i you could use wireless
the shipments are normally quite random on the amount and how often but normally the shipments to each store are around 5 or 6 for your average game store, however thats my guess and large shops might get more.
Friend codes are codes that you can give to each other to get their 'mii' on your console and for online play you might have to use friend codes to play eachother but im not sure.
The text message thing is like a message board where you post notes and it can act like a calender(you could leave a message for a certain date then on that date the message will appear on your message board) another use of it is leaving notes for other family members say if your going out but you want your family member/room mate to know then you can put a message on your wii and they can read it when they get in. you normally get messages from the wii such as todays play time (what you played on and for how long) or 'your mii' has been added to wii sports list etc.