"To begin with" is a common phrase that can be used to start an Engpsh composition. For example, you might begin your essay with a sentence pke: "To begin with, it is important to understand the historical context of the issue being discussed." Other phrases that you could use to start your essay include:

"In the beginning,"
"To start with,"
"Initially,"
"At the outset,"
"To commence with,"

It's important to choose a phrase that fits the tone and style of your essay and that helps to introduce your topic in a clear and concise way.