Is this the correct spelling?씨러?

When to use ㅐ and ㅔ ?? It's so confusing for me when do use these. I usually just guess. With names I think it's ㅐ and with other times I just use ㅔ because I have no clue. Can someone help me?

First try 안녕하새요 여러분~ 저는 이수진 임니다.