What NLE did you use for picture edit? Many have audio programs that you can use for ADR. FCP has Soundtrack Pro, Premiere has Soundbooth, etc. You can use the VO Tool in FCP, too. Then you need a decent mic and mic pre and a way to get the signal into your system. If you search the forum you should find a number of suggestions of how to “treat” a room for recording to eliminate hollowness, echo, etc..
John
MacPro 8-core 2.8GHz 8 GB RAM OS 10.5.8 QT7.6.4 Kona 3 Dual Cinema 23 ATI Radeon HD 3870, 24″ TV-Logic Monitor, ATTO ExpressSAS R380 RAID Adapter, PDE enclosure with 8-drive 6TB RAID 5
FCS 3 (FCP 7.0.3, Motion 4.0.3, Comp 3.5.3, DVDSP 4.2.2, Color 1.5.3)
Pro Tools HD w SYNC IO & 192 Digital I/O, Yamaha DM1000, Millennia Media HV-3C, Neumann U87, Schoeps Mk41 mics, Genelec Monitors, PrimaLT ISDN