Whenever you want to say “I have something” in Russian, you should use the special construction “у меня есть” which basically translates as ”there is something near me”.​

Пример
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• У меня есть сумка. - I have a bag.
• У тебя есть ручка? - Do you have a pen?

Note: before vowels there is an extra “н” added (у него, у неё, у них).

Пример
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• У неё есть скейт. - She has a skateboard.
• У него нет телефона. - He doesn't have a telephone.