The meaning of the numbers on the clubfaces?

For almost, a number on a clubface represents the loft on that one. The smaller number is,  the less loft is but the longer club is. The longer clubs with less loft hit balls farer but accuracy falls off. This also means that clubs with smaller numbers hit harder.

Which clubs are included in a set of clubs ?

A set of golf clubs is limited to 14 clubs. To create a set of clubs, it depends on your preference. Generally, a set of clubs will include the following clubs:

-Irons: 3,4,5,6,7,8,9, PW

-Woods: 1,3,5

-And a putter

This does not mean that you must bring all of your clubs to the golf course. For example, a beginner can carry a driver (the wood No.1) or a 3-wood, 3-, 5-, 7-, 9-irons, and a putter. So you do not need to bring the ones you do not like.

Choose the suitable flexibility of the shaft ?

The most important part of a golf club is its shaft. And one of the most important elements to choose a shaft is its flexibility. A club’s flexibility is connected to how  stiff the shaft is. If you are staying at a golf shop and dazzled by the constant fall of the types of clubs on display, you'll realize there are some sticks harder than others. Players as well as they prefer hard sticks.

Sticks as hard, the level of the less elastic. When players swing the bat, the club head weight less. When players swing the club head weight of the stick will bend sticks. When the ball went down the rod, the player makes the curve in the shaft. If the elastic and curved sticks too much, players can not control the ball will go flying. Bend of the rod is where the power generated most of the shots. If sticks are not elastic enough blow force is reduced and accuracy is also affected. So you should choose sticks with elastic fit me.

Generally, it sticks as hard hit as accurate, but the shorter distance.