Do a search here, NLE, Software and then if you find it unhelpful, specific queries
What will happen with your thread if non specific is simply get us all praising our favourites
I have several of currently available and popular ones but realise not every body will get on with all of them
Here are a few threads to get you going
Software for a novice video editor? Definitive list of editing software... editing software Video editing software
Free software is available within Windows anyway, as Windows Movie Maker.
Combined with Nero most folk can do some editing and DVD authoring without spending more
Free however doesn't always mean easy to use, although WMM is easy to use indeed, even if it is limiting as you advance. It does have a following though
HERE
As for what you need. a second Large Hard drive for video only (if possible) , would be handy in addition to the firewire card and software and more RAM if you have less than 1Gb
Note too that software have different hardware specifications and the minimum may find you struggling