Samkalpa
Having recited the day, nakshatra, etc, one has to pronounce as below :

Mama upaatta samasta duritakshayadvara. Sri Parameswara preetyartham - Karishyadvarasya - Sri Hariharaputra Pooja Karmanah nirvighnena Parisamptyartham Adu Sriman mahaganapathi Poojam Karishye

Aaasanam Samarpayami
Arkayam Samarpayami
Paadyam Samarpayami
Achamaneeyam Samarpayami
Snanam Samarpayami
Snananandaram Achamanyam Samarpayami
Vastra Yagnopavidha uthriya abhanartham akshadham Samarpayami
Divya Kandhan tharayami
Divya Kandhastha harithra kumkumam Samarpayami
Puspamalam Samarpayami
Ganesh Pooja

Offer workship to Ganesh's Photo / Idol / Deepam:

Om Sumukhya Namah
Om Ekadantaya namah
Om Kapilaya namah
Om Gajakarnakaya namah
Om Lambodaraya namah
Om Vikataya namah
Om Vighnaraajasya namah
Om Ganadhhipaya namah
Om Dhoomaketave namah
Om Gandhyakshya namah
Om Phalachandaya namah
Om Gajananaya namah
Om Vakratundaya namah
Om Shoorpakarnaya namah
Om Herambaya namah
Om Skandapoorvajaya namah
Om Sreeman Mahaganapataye Namah
Nanavidha divya parimala pushpani Samarpayami. (offer flowers)

Naivedyam
Sprinkle theertham on fruits, Jaggary and banna:
Om Bhoorbhvaswah tat saviturvarenyam Bhargo devasya dheemahi dhiyo yo nah prachodayat |
Omapo Jyotiraso Amritam brahma
Praanapanna vyanodana Samaanahya namah Mahanaivedyam Samarpayami.

Karpooram:
Karpoora neeranjanam samarpayami
Pray with folded hands:
Vakratunda Mahakaya Soorya Koti Samaprabha
Avighnam Kuru me deva Sarvakaryeshu sarvadaa
Sreeman Mahaganapathaye namah
Shodashopachara projam samarpayami
Sreeman Mahaganapathih Supreeto bhavatu.
Place scared rice in your palm and with a spoon of water leave it into the arghyapatram:
Ganga cha yamune chaiva Godavari Sarasvati
Narmade Sindhu Kaveri Jalesmin Sannidhism Kuru
Kalasha devatabhyo namah