Generally, your initial exit was a deportation because you left during proceedings which triggered a 10 year bar if you had been in the U.S. longer than 1 year without status. Your second illegal entry and subsequent DUI and removal likely triggered a non-waivable/permanent 10 year bar. Talk with an immigration attorney for your case specifics, as this is only general guidance.
A motion to reopen removal proceedings should be filed either with the immigration court with jurisdiction or the BIA. Worst-case scenario is he can be detained at the interview. As far as what is most likely, your attorney would be your best resource to obtain this answer.
You may be able to petition for him. Your friend is likely referring to a sponsor. You must show that your household income is equal to or higher than 125% of the U.S. poverty level for your household size. (Your household size includes you, your dependents, any relatives living with you, and the immigrants you are sponsoring.)
You must also be at least 18 years old and a U.S. citizen or a permanent resident. Please consult with an immigration attorney.