P. Arthur Huprich published a terrific list of rules that you should consider as a starting guide.
                                    Commandment #1: "Thou Shall Not Trade Against the Trend." If  the market is going up then it is okay to have money exposed to the market – if  it isn't, don't.
     
    • Portfolios heavy with underperforming stocks rarely  outperform the stock market!
     
    • There is nothing new on Street. There can't be because  speculation is as old as the hills. Whatever happens in the stock market today  has happened before and will happen again, mostly due to human nature.
     
    • Sell when you can, not when you have to.
     
    • Bulls make money, bears make money, and "pigs" get  slaughtered.
     
    • We can't control the stock market. The very best we can do  is to try to understand what the stock market is trying to tell us.
     
    • Understanding mass psychology is just as important as  understanding fundamentals and economics.
     
    • Learn to take losses quickly, don't expect to be right all  the time, and learn from your mistakes.
     
    • Don't think you can consistently buy at the bottom or sell  at the top. This can rarely be consistently done.
     
    • When trading, remain objective. Don't have a preconceived  idea or prejudice. Said another way, "the great names in Trading all have the  same trait: An ability to shift on a dime when the shifting time comes."
     
    • Any dead fish can go with the flow. Yet, it takes a strong  fish to swim against the flow. In other words, what seems "hard" at the time is  usually, over time, right.
     
    • Even the best looking chart can fall apart for no apparent  reason. Thus, never fall in love with a position but instead remain vigilant in  managing risk and expectations. Use volume as a confirming guidepost.
     
    • When trading, if a stock doesn't perform as expected  within a short time period, either close it out or tighten your stop-loss  point.
     
    • As long as a stock is acting right and the market is  "in-gear," don't be in a hurry to take a profit on the whole positions. Scale  out instead.
     
    • Never let a profitable trade turn into a loss, and never  let an initial trading position turn into a long-term one because it is at a  loss.
     
    • Don't buy a stock simply because it has had a big decline  from its high and is now a "better value;" wait for the market to recognize  "value" first.
     
    • Don't average trading losses, meaning don't put "good"  money after "bad." Adding to a losing position will lead to ruin. Ask the Nobel  Laureates of Long-Term Capital Management.
     
    • Human emotion is a big enemy of the average investor and  trader. Be patient and unemotional. There are periods where traders don't need  to trade.
     
    • Wishful thinking can be detrimental to your financial wealth.
     
    • Don't make investment or trading decisions based on tips.  Tips are something you leave for good service.
     
    • Where there is smoke, there is fire, or there is never  just one cockroach: In other words, bad news is usually not a one-time event,  more usually follows.
     
    • Realize that a loss in the stock market is part of the  investment process. The key is not letting it turn into a big one as this could  devastate a portfolio.
     
    • Said another way, "It's not the ones that you sell that  keep going up that matter. It's the one that you don't sell that keeps going  down that does."
     
    The table below depicts the percentage gain necessary to get  back even, after a certain percentage loss.

        • Your odds of success improve when you buy stocks when the  technical pattern confirms the fundamental opinion.
     
    • You can lose money even in the "best companies" if your  timing is wrong. Yet, if the technical pattern dictates, you can make money on  a short-term basis even in stocks that have a "mixed" fundamental opinion.
     
    • To the best of your ability, try to keep your priorities  in line. Don't let the "greed factor" that Street can generate outweigh other  just as important areas of your life. Balance the physical, mental, spiritual, relational,  and financial needs of life.
     
    • Technical analysis is a windsock, not a crystal ball. It  is a skill that improves with experience and study. 
     
    Always be a student, there is always someone smarter than  you!
     
    I hope this helps clarify the some of the issues that you  wrestle with when it comes to managing your money.