Cycling and running use different muscles, in different ways. Your cycling will have given you a nice strong core, and the C.V. fitness, but you’ll find that if you try to go too long or too hard with the running, at the start, your legs will just grind to a halt, even though you’ve still got plenty ‘in the tank’. You’ll also find that warming up and down / gentle stretching, before and after your run are far more important, when running, to prevent any stiffness / injuries. It’s like everything exercise related really, build up gently, listen to your body, and you’ll be fine. As you get into it, you’ll find certain things that you do, because of the way your body is, during running, can be helped, by certain additions, selection of your kit, that will enhance your running, and make it more comfortable. As with cycling, there are ways / techniques, that will make your running more comfortable / efficient and enjoyable, that you’ll learn, or pick up along the way. The main thing ( for now ) is that you’re enjoying it, without that, it’s difficult to keep anything going. Good luck with it, keep it up
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