Though draw poker games are not online poker games widely played, there are interesting variants of these games that can be played. Like in any other games the following playing strategies apply for draw poker games also:-
• Never play without enough money for betting; 100 times the big bet can be a great limit, however, if you cannot make to it you need to at least

have up to 40 or 60 times the big bet.
• If you have good stating hands, play else better fold.
• If you happen to have a second hand, you need to make sure that you make it costly for others to learn that information.
In draw poker a winning hand is made from the following combinations. Normally wild cards are not used and it is being used in some games just for a change.
• Royal Flush refers AKQJ10 of the same suit
• Straight Flush is that which has a sequence of cards of the same suit.
• Four-of-a-Kind like four cards of the same rank like 4-4-4-4 or any others
• Full House like three-of-a-Kind along with a Pair
• Flush has any five cards but they should be of the same suit
• Straight refers to sequence of cards by rank in order dissimilar suit.
• Three-of-a-Kind has three cards of the same rank.
• Two Pair refers to a couple of pairs.
• Pair, two cards of the same rank can contribute to win, provided there is not a better pair with any other player.
• No Pair, possibly where there are no other players to claim.  It can be a mixed suit without any kind of similarity between the ranks of the cards.
The sequence in which the draw poker is played is as follows:-
• All players ante in to the pot.
• Following ante 5 face down cards are dealt
• A betting round follows.
• Every player discards the cards that cannot be used to form a hand
• The dealer deals replacement cards for the number of cards that were discarded.
• A betting round follows.
• The best high 5 ranking card wins.
There are several variations of draw poker like triple draw poker, double draw poker etcetera.  There rules for replacement and number of draws one can do is based on casino or online site norms.  Generally all 5 cards can be replaced, but it differs with casinos.

More tips about draw poker:

http://en.wikipedia.org/wiki/Draw_poker