How can a Hindu young man enter Islam to marry a Muslim girl, with his desire to fully embrace the Islamic religion?

To embrace Islam, you must pronounce the two testimonies (Shahadatayn): "Ashhadu an la ilaha illa Allah, wa ashhadu anna Muhammadan Rasulu Allah" (I bear witness that there is no god but Allah, and I bear witness that Muhammad is the Messenger of Allah). Then, you should perform a ritual bath (ghusl) with the intention of purification for prayer and practice the rituals of Islam. Your entry into Islam might be motivated by marriage, but with practice, your Islam will become purely for the sake of Allah. Communication between lovers outside the framework of marriage is impermissible; rather, a man should inform the woman's guardian (wali) of his desire to marry her. Your eagerness to choose a righteous wife, religiously and morally, indicates your sound judgment. Islam erases what came before it in terms of sins; so, if a disbeliever embraces Islam, his past sins are forgiven.