1. How do I save the N400 form>? I typed a bunch of stuff in Adobe Acrobat and nothing was saved.
First you have save the form on your computer. To do that right click once you highlight the form and click "save target as" and save it on your local hard disk. Then open the form and type in your information and then on the FILE menu there is a save option please use that to save your form
2. Part 2: Information about your eligibility:
My 5 years is coming up in Apr 2007. Can I still say that I am over 18 and have been a legal resident for the last 5 years or is there any other box that I need to check?
Yes you can say that and check that box.
3. Number of trips:
a. How many total days did you spend outside of the United States during the past five years?
Do I need to check for 5 years before April 2007 (I became a LPR in Apr 2002) or from the date of the application?
You need to check from the day you became a Permanent resident. So 5 years before April 2007.
4. H. Oath Requirements. (See Part 14 for the Text of the Oath)
I am assuming that I need to answer questions 34-39 when i send in my application, right?
YES
5. What is this selective service? Should we be worried about this?