Good new racket is always without string. You need select your own
string (type, brand, etc) and go with your own strength (e.g. 19lbs
for horizontal, 21lbs for vertical) when you tight it up.
If you are an offense player, you probobly need more strength on your
string. If you are a defense player, you need a bit soft string.
A good racket is very important whoever you are a beginner or professional.