Please note that there are no specific / prescribed Duas during Hajj and it is not mandatory to memorize these duas. While it is preferable to read these duas/intentions in Arabic, they can also be made in your own language.
Reciting Talbiyah correctly:
The 3rd line of Talbiyah should be read in its entirety. One should not stop after Innal Hamda and after Wan Ne'mata but should recite the complete sentence in one breath (Innal Hamda Wan Ne'mata Laka walMulk).
Intention for Umrah
Intention for Hajj
Intention for Umrah & Hajj together (Hajj-e-Qiran)
Repentance for sins and mistakes
On leaving Home
Before starting the Journey