to find out calories your just look at the packaging of the food your eating. they usually have it at the back.

With exercising I think its best for you to do full body work outs. As you are not big yet so it will help you gain mass.

Doing the big muscle exercises such as:
Deadlifts
Squats
Bench.
These help in building your core and many muscle groups at one time.
Just make sure your form is right or else it won't help much.

Also look into free weights as they help build up more muscles than one particular group.
Simple things such as when doing bicep curls you stand up, so it also works on your legs and back to keep your body balanced.

These are little simple things that will help with adding mass to your body and strengthen your core.

And if your looking to gain weight the best way for me was I ate anything anywhere anytime.

I just constantly eat! that is the luxury of being skinny!

I did this and I gained my weight to 70kg and I'm 168cm. After hitting the gym I increased my mass and weight to 78kgs. So don't worry too much.

As long as you eat and exercise properly you will gain mass eventually