How to write an introduction

The following sentences are about ' how to write a personal statement'. If you see any problems, can I have your commens?

( teacher to students)

There are a couple of things you have to keep in mind when you write a PS( personal statement). In terms of length, I think 250 words or 300 words maximum are enough. Don't exceed more than 2 pages. Also, it sould be single-spaced and as for font, you should use roman form. For your first paragrpah, you should think about the purpose of writing a PS. In other words, you should answer the question' why do you want to write a PS'? You can open your sentence by directly saying ' I would like to study.. or by saying from when you started having interest in that subject. Also, you have to include your interests and how you would like to develp them. In addition, you should avod writing things that mention school's opninions, such as my teacher tells me I am good at math.