I'm going to answer your questions here, because I think they are valid. I will, however, echo the sentiments of others in the thread - why do you have a mileage goal? I am a cyclist, and I LOVE to ride my bike. I don't set mileage goals (though I do track to see if I am ahead or behind last year) - I ride because I love it. If you set a goal, and you only ride o achieve that goal (and not for the sake of riding), then it seem pointless to me...

1. What kind of bicycle(s) do you ride?
Road/cyclocross/MTB/TT

2. Do you do anything except ride during the riding season? (work, clean house, cook, take care of parents, etc.)
I work full time and maintain 3 homes. While I don't have children, I do have all of the household chores as well as increased planning depending on what location we will be in.

3. Do you ride in bad weather? What kind of weather will you not ride in? (i.e., severe downpour, high winds, temperate, etc.)
Yes. I've ridden in rain, thunderstorms (though not on purpose), snow storms and on ice. I also ride from January through December despite living in the Northeast. Being prepared with equipment and apparel is key here though. And again, I ride because I love it! I will also ride indoors if the weather is particularly awful out.

4. Do you have apparel to ride in all kinds of weather?
Absolutely. Over the years I have accumulated all of the gear for riding in any type of weather - cold, wet, windy, warm. Having the right clothes is important to continuing to enjoy the ride. Bad clothes can make a fun ride miserable in a hurry.

5. Do you ride at night? (something I absolutely refuse to do)
Yes. At this time of year, and through the winter, I don't have a choice. We have great lights and will go out for a couple of hours in the dark. I did my first dark MTB ride of the season just last night. Again, this helps to keep things fun, since it changes the regular routines and routes.

6. Do you use clipless pedals? Does anyone only use plain pedals?
Clipless

7. How many mph do you average? If I average between 11 mph and 12 mph do I have any hope of ever achieving a goal of 1000+ during a riding season?
I'm with Eden on this one - this is irrelevant. Your average speed depends on too many variable to compare with other people not riding the exact same routes that you are.

8. Do you ride mostly on trails or on roads?
I ride anywhere my bike will take me - roads, gravel roads, MTB trails...

9. Are the trails/roads or flat, hilly, steep hilly, or mixture?
Mixed here, and I will occasionally ride places where there is no flat.

Good questions for sure, but again, make sure that you are riding and setting these goals for the right reasons. Loving the ride is more important than how far you rode.

SheFly