I know guys who are USTA rated 4.0 who still just roll their seconds in. One guy I play is a feisty ball retriever who got bumped last summer from 3.5. His first serve is flat with moderate pace..his second is flat with no pace. He has no idea how to hit a slice or kick serve.
Off the ground he's a superior player to me, but I've been winning our matches lately because of serves and returns....I've been zeroing in on that second serve of his, and if my serve is on, he's starting every point of every game off in a major hole.
Learn how to hit a reliable second serve kick now before you get into bad habits.
3.5 player. Equipment: Prince Original Graphite OS, Tourna Big Hitter Blue