You can start with any basic reloading kit that can be purchased locally or thru internet locations like midway. In addition to a basic kit I would recommend adding several other reloading manuals for reference and upgrading to a digital scale. The digital scale might cost as much as some reloading kits but it will make your life easier. Here is a reloading 101 thread on another forum that is worth reading-
http://www.snipershide.com/forum/ubb...6660#Post96660
I will thow out one word of caution-- reloading is addictive :) Once you start it is easy to find yourself always want to do more. As you may have gathered reading the thread there is not much factory support with ammo or brass but considering your needs I dont figure you will be needing thousands like some of us. My offer for 100 pieces of free brass still stands- just PM me an address and I will get it out to you. I went thru 3k rounds last year so I have tons of brass.
As for the barrel- do you know what rifle you would want this for? The easiest way is to go with a Thompson Contender. They offer a whisper barrel and that would give you unlimited options down the road. If you are not interested in a TC I will wait to hear your thoughts before I suggest other barrels or options.