Here are some good guidelines on how much to raise and when:

In Early Position: Raise 3x BB
In Middle Position: Raise 4x BB
In late position: Raise 5x BB
In Small Blind: Raise 3.0xBB
In Big Blind: Raise Pot

There are many reasons for this, which I will outline below: When first in the pot, Raise!

1. Limit the competition
2. Take control of the betting
3. To better define your opponents hands
4. To hide the strength of our hands
5. To win the blinds

Because you lose out on position, and also because you are forced to have money in the pot, you are generally going to lose money while being in the blinds.  Do not invest money in the blinds if you do not have to.  Fold your small blind, and accept that losing half the big blind is better than losing more.

Sure, getting great hands helps – but on top of having a great poker hand, you need to find the best situation to play them.  Pay attention to your table.  Find the situation and the players that you can best take advantage of.  If a player just lost a big pot and raises - take advantage of his thoughts.

If you are playing Omaha High Low, it is important that you raise in late position with an Ace Deuce Suited.  There are a couple reasons for this, but the main reason would be:

You should generally be playing a tight game in Omaha High Low.  So if you are doing this, when you get the opportunity to pretty much guarantee doubling the pot, there is no better hand to do this than an A2XX suited!  Make the best of your opportunities!