I don't have a Will Chalker's body, but it kinda looks the same, if you think away the abs
Don't think of supplements as something negative, they can some much needed stuff the help your body. Just make sure you don't use any junk. For example I use protein, calcium/magnesium tablets and vitaminpills. Your muscles contain of protein, so you need to eat things that contain protein such as fish, meat, poultry etc. Most of the time you can't consume enough protein as needed, so you that's where proteinshakes come in. When I've worked out (MMA and sometimes weights) I use a shake afterwards to make sure my body has enough protein during the night to recover. How much you need, is something you have to calculate. It's at least 0.8 gr protein per kg bodyweight. Most people who do extensive workouts with weights use shakes in the evening before going to bed and when they wake up, again to make sure their body has enough protein to recover the lost muscle mass.
I use calcium/magnesium because of my lactore intolerance...so you may not need it. Vitamine effervescent tablet (sp?) are also handy to add some extra vitamins to your body. I use one a day. When it comes to food, make sure you eat about 6 times a day. Don't forget breakfast, because that's probably the most important meal of the day. Don't eat too much fatty foods. Eat healthy. Try to sleep well and let your body rest enough, because you actually make muscle mass in your sleep.
Creatin also works pretty well. I haven't used that, but friends of mine have and they're very pleased with it. There's a lot of information on the internet when it comes to training and supplements. But don't use them immediately. Try to calculate what you need and try to get it with your food. All the extras you can get from the supplements.
I can't really make a workout schedule, for somebody else because I'm not an expert when it comes to pure bodybuilding. But I'd advise you to train at least 5 days a week and try to rest one day. A lot of people don't do cardio when they're trying to put on mass. I always thought that was stupid, because your heart is also a muscle that needs training.
Don't forget, training is all about discipline. At times it's not gonna be fun, but that's where the real diehards continue..especially when you're motivated. Also think about why you want to put on muscle mass. Girls? Selfconfidence? Aesthetics? The wrong motivation can be a discipline killer.