What is another way to say To begin with?

Here are some alternatives to "To begin with," depending on the context and desired tone:

Formal:

* Firstly,

* Initially,

* At the outset,

* First and foremost,

* To start,

* As a starting point,

* In the beginning,

Informal:

* First off,

* Let's start with,

* For starters,

* First things first,

* Right off the bat,

More specific:

* Concerning... (when introducing a specific topic)

* With regard to... (when focusing on a particular aspect)

* In terms of... (when emphasizing a specific perspective)

Choose the option that best fits the tone and style of your writing.