As a beginner, i recommend you do a diet plan to make sure you are getting the right amounts of nutrition. Find out your daily recommended calories and add about 300 to it. Then get about 50 percent total of your calories from carbs. 30 percent from protein and the other 20 percent from fat.
"Anyone wanna give me some advice..Im really trying to eat more but not very easy when your appetite is minor."
Something such as almonds, milk ect. are not very filling but high in nutrition.
Have you got a weight training program sorted out?