It’s very simple.
Buddhism is a non-deistic Religion. Therefore there is no official ceremony that you have to participate in. You can, but you can equally do it in the privacy of your own home, and it is just as valid, significant and meaningful. do this, and you will be Buddhist.
Try to do this infront of an image of the Buddha, or a small and significant (to you) object or image which personifies Buddhism to you.

You can do this in either English or Pali, whichever you want.

Taking Refuge:

Buddham Saranam Gachami
Dhammam Saranam Gachami
Sangham Saranam Gachami

Dutyam-pi Buddham Saranam Gachami
Dutyam-pi Dhammam Saranam Gachami
Dutyam-pi Sangham Saranam Gachami

Tatyam-pi Buddham Saranam Gachami
Tatyam-pi Dhammam Saranam Gachami
Tatyam-pi Sangham Saranam Gachami

This means:
I go for Refuge in the Buddha
I go for Refuge in the Dharma
I go for Refuge in the sangha.

For the second time, I go for Refuge in the Buddha
For the second time,I go for Refuge in the Dharma
For the second time,I go for Refuge in the sangha

For the third time,I go for Refuge in the Buddha
For the third time, I go for Refuge in the Dharma
For the third time, I go for Refuge in the sangha.

Then you recite The Five Precepts:

I vow to train myself to refrain and abstain from :
•Hurting, killing or maiming any being – to do no Harm;
•Taking anything, which is not freely or willingly given;
•Speaking unwholesomely and unpleasantly, and using false, divisive deceitful speech
•Indulging in improper sexual pleasures or participating in sexual misconduct;
•Consuming intoxicating substances which confuse the mind and cloud the judgement.

That’s it.
You’re Buddhist.