Farmerlor is right. Squash and cukes grow a taproot, and if you try to start them inside, you will most likely start them too early (they grow so fast!) and they will get huge, and the taproot will get all messed up when you transplant. You are better off to direct sow, and they will typically "catch up" if they get planted a little late due to cool weather. In Florida, with a longer growing season, you shouldn't have to deal with this much. You could even plant them a couple weeks apart, so that way you will have a continuous supply of healthy plants for a long time. Squash and cukes tend to poop out toward the end of summer here, so I sometimes plant late ones. I do have to hand pollinate most of the late ones though, since there's fewer bugs to do it.