For this text, you should get the OCR endorsed commentary. It is published by bloomsbury:

www.bloomsbury.com/uk/livy-history-of-rome-i-a-selection-9781350060388/

You will also find it useful to have more than one copy of the Latin text to write on. Should you need another copy, here is the file:

Finally, to help with the preparation of each chapter, you will find this running vocabulary list extremely helpful: