Start out by playing a single table.
It can be tempting to jump right into multi-tabling, as one of the many benefits of playing online is the ability to play more than one table at a time (though recently, some players have been spotted multi-tabling in live tournaments too). However, a great understanding of the technical aspects of online poker will assist the player in the weeks to come. Learn to win online poker consistently on one table. Then, once the player feels confident maneuvering a single table, he can begin adding one table at a time as dictated by his comfort level.