Preparing myself to prove the existence of God! Yikes

I've decided to partner with a friend from church and lead a group on apologetics designed to tackle tough questions and doubts about the existence or nature of God. So for the last 3 months I've been reading non-stop about Christian apologetics, listening to podcasts regarding different theological arguments, and watching debates between renown Atheists and Christians. It's really mind-bending stuff this apologetics!

But just a small excerpt that I found wonderful with regard to the argument of there being an explanation for all that has begun to existence, "Imagine that you're hiking through the woods and you come across a translucent ball lying on the forest floor. You would naturally wonder how it came to be there. If one of your hiking partners said to you, 'Hey, it just exists inexplicably. Don't worry bout it!' you'd either think that he [were] crazy or figure that he just wanted you to keep moving. No one would take seriously the suggestion that the ball existed there with literally no explanation. Now suppose you increase the size of the ball so that it's the size of a car...size of a house...size of a continent...planet...universe."