The first thing to do on embarking for Hajj is to purify the intention for Allah

The first thing to do on embarking for Hajj is to purify the intention for Allah The Almighty and to emulate the Prophet, ﷺ, in all the rites of Hajj, for he said: “Take your Hajj rites from me.” [Muslim] The Prophet, ﷺ, also said: “Whoever performs Hajj and does not engage in sexual relations nor acts sinfully, he will return (after Hajj free from all sins) like (he was) the day his mother gave birth to him.” [Al-Bukhari and Muslim] He also said: “Performing ‘Umrah after ‘Umrah will erase the sins committed between them and the well-performed Hajj has no reward but Paradise.” [Al-Bukhari and Muslim] A good Hajj is one that is done with sincerity, according to the Prophet’s guidance and in which one abstains from sins and harming other Muslims. -islamweb