You need to download the entire Blockchain. This is an arduous process as the blockchain I believe at the moment is something like 17-20 GB. Also, you will not get paid right away because a share is found. Usually with pools, you need to set a payout minimum...I've seen it to be as low as .01 so unless you add hashpower, I don't think you will ever get paid. See below. If you are dying to know your balance and the blockchain hasn't finished downloading, use this link here to see what your balance at any given moment in time is:
Yes, we all start somewhere, but you could have likely gotten your answer going to someplace like #bitcoin on webchat.freenode.net. Saves the embarrassment because people expect you to ask newbie questions in a chat and you can get your answers right away...doing it this way makes you seem lazy...REGARDLESS of the hours you may have spent before coming here trying desperately to figure out the answer for yourself. You show apprehension about asking newbie questions which leads me to believe that you do ask a lot of questions before researching for the answer before hand. I am totally assuming that and could be completely incorrect.
Holy crap you're only doing 100 MH? You must be GPU mining with something like a 6800GT or something like that. You aren't making anything from that nowadays:
Without factoring in electricity, you can expect to make forever, at the end of mining a total sum of ....wait for it.....: .004 BTC (which could end up being $2000 IF Bitcoin reaches 500,000 USD one day.) If the price stays around 700 dollars then you're looking at a payout of 2.80 USD one day, just enough for a 40 :D
Latency from your HDD isn't an issue, neither is the internet speed. You just need to wait for the whole blockchain to download before you will see mining revenue come in on that address. Also, finding a share doesn't really mean anything - they equate to literally .00000010s of Bitcoin each and it takes literally millions of them to make Bitcoins.
You should probably consider buying a few block erupters instead and mining with those - easier setup and they will likely ROI back in USD as long as the price remains high and you're not trying to start in the middle of next year.
Your graphics card uses a lot of power to mine so you are losing as your electricity costs appear to range between 50-60 dollars a month.