Now for the real answer to your question. No-one on this BB is allowed/qualified ( as far as I know) to give investment advice, which , in a nutshell, is what you are asking for. If someone was to do so, this whole site would be in jeopardy from the FSA. That's not to say that you won't get helpful replies from many people. The real crunch here is that you are clearly a beginner and you need to get some experience and skill behind you before (as you stated earlier) you'll lose the lot...
For example, what on earth led you to think that the market would go back up to 10,500 again? My expectation at 18:50 was that a likely target was 10,530.....and no more. As it turns out, there is a little more, but not because of any pre-conceived ideas..
There are well documented threads on trading the Dow on this BB and in them you will find untold gems of information and tips . One of which is to take an exit on a 3 pk Negative Divergence that spreads across a MINIMUM of 25 minutes. 9 times out of 10 ( or more) this will be the top of an intraday rally. Today is one of the very few exceptions that you will see. Do not be phased by this and think ' If only I had held on a bit longer, I'd have made another 5 points'.... The other 9 times you will lose 20 points!!! There are a few days where the Dow seems to be on steroids, and there are days where it just doesn't want to go anywhere.
Take what the market gives you. and not a penny more.
Today , I had an idea that something was not quite right with the Dow, and I'll explain in my Dow Report tonight if you want to know why...