I"m not sure how you tend to address the Boston Tea Party; but if you wish to discuss how it affected the colonies' relationship with Britain, you might use as your thesis that the Tea Party was in reaction to perceived interference by the East India Company with Colonial commerce. It met with considerable criticism on both sides of the Atlantic. Many in the colonies believed that the perpetrators had overreacted; in fact Benjamin Franklin offered to pay for the tea from his own funds. In Britain, the Tea Party led to imposition of the Coercive Acts. Though intended to punish the people of Boston for the raid and bring them into line, it had the opposite effect and brought the formerly disunited colonies together in protest.

In case you were not aware, the Tea Act which led to the Tea Party did NOT impose a new tax on tea; in fact it lowered the price. It did, however, insist that tea could only be purchased by merchants operating under the British East India Tea Company. The company had ties with Lord North, the British Prime Minister. The effect was to deprive colonial merchants of the tea trade which led to the protest.

Hopefully, this will give you enough information to get started.