My boyfriend and I are yet to have our first kiss and I don't know how to give him the kiss, but I want it to be a surprise.
He plays basketball and we aren't able to go on any dates around this time.

Wait until you have a quiet, nice moment alone. Hold his hands, or give him a hug, while hugging him say something like "I really like you" then lean in and kiss his lips. Don't worry too much about the specifics of the kiss, you don't need to use tongue, you don't need to count how long the kiss lasts for. Just let his lips press up against yours and feel the magic! He's probably nervous too. Have fun! I'm married now and I miss first kisses :)