Been seeing a lot of first attempts lately so here's what I wish someone had told me before I cooked my first perf board. Heat the pad and the pin togehter, not just the pin. If you're holding the iron on the pin and dripping solder onto it hoping it flows down, that's the mistake. Solder follows heat, so touch the iron to where the pin meets the copper, feed the solder in at that joint, and it'll wick right in.
Three or four seconds is plenty. If the joint hasn't taken after that, pull off, let it cool, try again. Lingering on the pad is how the copper glue lets go and the pad lifts, and once a pad tears off there's not much coming back. Keep the tip clean too. Wipe it on a damp sponge or brass coil every few joints, a gunked tip transfers heat badly and makes you press harder, which makes everything worse. Get some flux if you can, even a cheap pen. It fixes 90 percent of cold, lumpy joints. And honestly, junk boards and scraps are your friend for the first hour before you commit to anything you care about.