bodyweightx20= 130x20= 2600...... try to eat this many calories a day over 6 small meals. get it all from healthy foods= lean protein (chicken, fish, turkey), complex carbs (brown rice, oats), and lots of vegetables. if you do this for a month and notice no difference, increase the calories by 500 a weak untill you see progress.
.... i did some more math and here is how much of what you should strive to eat each day:
protein- 200 grams
carbs-360 g
fat- 100 g
these numbers are just estimates you may need more or less of any of these, but this is a good place to start. if you can eat 6 meals a day, this comes to....
30 grams of protein per meal
60 grams of carbs a meal
15 grams of fat a meal
if you dont eat like this, your progress will be minimal or nonexistent. understand that this is what it takes.
as far as lifting weights- what everyone else said. compound movements with good form. good form is very important. so is progressive resistance. this means that you write down exactly what weight you lifted and how many lifted it for every exercise that you do. the next time you do those exercises, try to do more repetitions. if you can do 2 more reps- the next time you go to the gym, add 5 pounds to the exercise. every workout, you should either add weight or do more repetitions. if you cannot, then you have hit a plateau. don't expect this for 6 months to a year.
finally, as a beginner, supplements are irrelevant. they ONLY help if you have everything in your diet and training perfect. they are expensive. they don't help near as much as hard work and dedication, and many people have gotten absolutely huge without them. don't waste your money on anything but whey protein and groceries.
put in the time.... do what i said, and expect to grow : ) good luck