Ask them whether they have incorporated as a not-for profit in their state and whether they have applied for an IRS 501© exemption.
Ask them whether they a have a corporate attorney and accountant on retainer (or doing pro-bono work)
Ask them who their vets are and how they provide financial planning for vet services
Ask them who is on their board of directors
Ask them where the funding for this "organization" is coming from
Ask them whether they have worked with/for non-profits before and in what capacity.
Ask them whether they have studied marketing, fundraising, organizational structure.
Ask them who is supporting THEM (perhaps wealthy parents? A retirement fund? Other?)
Ask them who owns the land their rescue is on and whether they are properly zoned for this endeavor

There is nothing worse than well-meaning people taking in too many animals and then, when they run out of money or simply cannot do it any longer, instead of having 5-10 birds to place they have 100 or 200!

If you are interested in setting up a sanctuary, you could visit Best Friends Sanctuary in Utah and take their workshops in setting up a shelter....or the ASU in Tempe AZ and take their grad level non-profit courses or work for a facility for a year or more before starting your own. You just might fine a sanctuary that is already established and meets the above criteria that you could join forces with instead. They could always use the help! Or, instead of just taking in an un-wanted parrots out of the goodness of your heart, you could use your energy to educate the parrot owner to work towards a compatible relationship with that bird OR help re-home that parrot into another loving family that will give them the one-on-one attention they deserve and is a life long home. A sanctuary should always be the LAST resort!