ich spiele = I play/am playing
ich spiele gern Gitarre = I like playing guitar
I play = Ich spiele
Ich spiele die Guitarre für Sie
"Ich Spiele gern" means " I like games" or" I like play"
I go to netball, it is ok = Ich spiele Korbball, es ist ok
I play Guitar
Ich spiele mit dem Hund. (Dativ!)
In German, "gern" or "gerne" is an adverb that literally means "willingly" but often translates in context to mean "to like to do something," e.g. "ich spiele" means "I play" but "ich spiele gern" means "I like to play." The difference between "gern" and "gerne" has purely to do with euphony; there is no difference in meaning.
Auss(or ß)erdem wohnen meine Kusinen (or Cousinen) dort, mit denen ich spiele.
Depending on context, ich besuche meine Freundecan be translated as:I visit my friendsI am visiting my friends
Olympische Spiele
die Olymischen Spiele
Do you mean 'I like to play football'? That would be 'Ich spiele gern FuBball" If you do actually mean 'you like to play football' that would be "du spielst gern FuBball" If you mean "Do you like to play football?" that would be "Spielst du gern FuBball?"