Okay, there is no such thing as a "Boom Mic." Almost any mic can be hung on the end of a boom-pole. There are a number of mics that are preferred for production sound, such as shotgun (lobar) mics and hypercardioids (hypers). Professional boom-ops use primarily shotguns, but less experienced folks should use a hyper indoors to somewhat mitigate the hollow, echoey roomy sound so prevalent in indie productions. Lavalieres (lavs) are another subset of microphones used for production sound, usually in conjunction with wireless systems.
The AT2020 is much too cumbersome and much too sensitive to even the mildest of wind to be useful as a production sound mic, it is also very difficult to aim properly. A boom-op "swings" the mic on the end of the boom-pole from actor to actor as they say their lines. The diaphragm should be pointed at the notch at the base of the throat/top of the breast-bone. Even these small motions will create a "breeze" that will be picked up by an LDC (Large Diaphragm Condenser) mic like the AT2020, and the diaphragm of an LDC, because of the weight of the mic, could never be properly aimed. It could possibly be used - but I most definitely do not suggest it - as a plant mic.
Pro Tools is a DAW (Digital Audio Workstation) that was originally designed for audio post production purposes. In the last decade or so PT has also become very popular with music folks as well. Full blown PT systems are very "deep" and extremely expensive. For audio post PT hardware currently comes in four flavors - SE starts at about $150, LE starts at about $1,000, PT Native starts at about $4,000, and PT HD core systems start at about $6,000 and can easily go up to five figures. This does not include control surfaces. PT software can also be used with other interfaces, although not quite as seamlessly as with AVID/PT hardware/interfaces.
Other DAWs (Nuendo, Logic, Cubase, Digital Performer, to name a few) can be used for audio post, and although they do not have the extreme depth and versatility of Pro Tools, will work just fine for indie productions.