Kit
The question you need to ask yourself is, what am I planning to do with this feature when I've made it?
Your decisions on kit will be determined by your answer to this question.
Final draft is a good piece of software. I don't use it myself, but I know a lot of people who like it.
If I remember correctly, the Panasonic AG-DVX100 is a semi pro camcorder, but with progressive scan which gives a more filmic look. It is however, if we're talking about the same camera, a mini DV camera. I also think that it's a 4:3 ratio camera, without a true 16:9.
If your intention is to shoot a feature length production, in order to demonstrate your ability to pull together a feature, then I don't see any problems with this camera (You might look at the Sony PD150 asa well). If, however, your intention is produce a movie that you can sell, this camera probably isn't going to give you sufficient picture quality to make a sale.
What it is though, is a really good camera for learning about basic film production. My understanding, is that that is what it was designed for.
In terms of editing software, Avid Express is used a lot in the TV industry for ENG, unsually in conjunction with cameras like the Panasonic or the Sony PD150 (which at least is DV Cam). My preference for low end video editing is Final Cut Pro. I must admit though, that I despise MS Windows with a passion and am completely Mac based.
What I really advise s for you to think about what return you are expecting to get out of this investment in kit? Before you spend thousands on camera equipment and video editing software, do some research into what films that get distribution are shot on.
At the moment, with very few exception, we are talking about Super 16mm Film, 35mm Film and High Def Video, with maybe new formats like Panasonic Pro50 and DigiBeta having a handful of sales.
It is true that there is a whole underground movement of mini dv movie makers, many of whom distribute through non-industry methods. Some of them do fantastic work. Your equipment list would fit that profile perfectly.
In my opinion it's better to invest time and money in the script and researching where the movie is going to be seen, before making any rash decisions about kit. The kit doesn't make the movie, a good script, good cast, good locations and an understand of distribution get the movie made and seen.