denoise clips before importing in premiere

[codemaster]

These are the actions that I want to do:
a1: deinterlace mpeg 2 clips;
a2: crop 2 pixels from top, bottom, left, right;
a3: resize mpeg 2 clips to 16:9 resolution with square pixels and mod2 vertical resolution;
a4: denoise the clips, because they were recorded in low light and have alot of noise;
a5: import the clips in premiere pro cs3, edit them, adjust their tonality and color grade them;
a6: export with debugmode frameserver, and encode to progressive H.264, with x264.

Problems:
p1: I have no idea what codec to use. For example, if I use avisynth to deinterlace, resize, crop and denoise, then I have to use virtualdub to export to avi, but there are so many codecs: huffyuv, lagarith, ffv1, msu, cineform, dv and many others. All I know is that I should use an intraframe codec for editing, but I don't know wich one to use;
p2: I don't know what the best tools are for the actions listed above. For example, is sorenson squeeze better than avisynth + virtualdub ?
p3: I don't know what denoise filter to use in avisynth. How can I find the right denoise filter for the amont of noise ? Wich denoise filter is the best ?
p4: What is the correct order of filters in avisynth: deinterlace->crop->resize->denoise, or deinterlace->crop->denoise->resize ?

Here are the technical details of the clips, in case they are needed:

General
Complete name                  : F:\clip1.mpg
Format                         : MPEG-PS
File size                      : 15.0 MiB
Duration                       : 20s 608ms
Overall bit rate mode          : Variable
Overall bit rate               : 6 093 Kbps

Video
ID                             : 224 (0xE0)
Format                         : MPEG Video
Format version                 : Version 2
Format profile                 : Main@Main
Format settings, BVOP          : Yes
Format settings, Matrix        : Custom
Format settings, GOP           : M=3, N=12
Duration                       : 20s 560ms
Bit rate mode                  : Variable
Bit rate                       : 5 716 Kbps
Maximum bit rate               : 9 400 Kbps
Width                          : 720 pixels
Height                         : 576 pixels
Display aspect ratio           : 16:9
Frame rate                     : 25.000 fps
Standard                       : PAL
Color space                    : YUV
Chroma subsampling             : 4:2:0
Bit depth                      : 8 bits
Scan type                      : Interlaced
Scan order                     : Top Field First
Compression mode               : Lossy
Bits/(Pixel*Frame)             : 0.551
Stream size                    : 14.0 MiB (94%)

Audio
ID                             : 189 (0xBD)-128 (0x80)
Format                         : AC-3
Format/Info                    : Audio Coding 3
Mode extension                 : CM (complete main)
Muxing mode                    : DVD-Video
Duration                       : 20s 608ms
Bit rate mode                  : Constant
Bit rate                       : 256 Kbps
Channel(s)                     : 2 channels
Channel positions              : Front: L R
Sampling rate                  : 48.0 KHz
Bit depth                      : 16 bits
Compression mode               : Lossy
Delay relative to video        : -120ms
Stream size                    : 644 KiB (4%)