You shouldn’t do that as a Sunni marrying a Shia is not advisable and it can be prohibited, depending on the belief of the girl.

My cousin is geeting married with Shia girl. I got the wedding invitation from the family. 1.Can we congradulate them? 2. Can we give them present? 3. Can we attend the wedding?

Q&A / Fatwas | May 26, 2014 12:48 am
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Among the 99 names of Allah there are “Al-Hadi” and “Ar-Rashid” which in English both are translated as “The Guide” (the latter in some places is also translated as “The Righteous Teacher”. The question is: can I use these attributes while praying to Allah to guide to Islam some non-muslim? And, do you see it as a good idea?
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I’m interested in a sister that goes to my masjid – Is there a permissible way for me to approach her, what can I do to get a marriage meeting with her?