I disagree. I assume you are riding a regular road bike where you are hunched over the handlebars and are forced to look "up" to see ahead. If so and if your neck pain goes away shortly after you get off the bike or lingers only as a muscular ache, it is normal for someone who has not been riding much recently. It is just muscular strain from your posterior neck muscles holding up the weight of your head and helmet when you ride. I get it every spring when I start taking longer outdoor rides. I think you should just gut it out. You neck muscles will strengthen and the pain will go away in a week or two. Stretching your neck is a good idea and you might want to try some aspirin if necessary but I think this is normal for a beginning cyclist. Of course, I am no doctor.