Transfer of Sponsorship for my son from a UK father to a private (individual) sponsorship (not a company sponsorship)

Grateful for any detailed input. I need to know the exact process, forms, Govt Dept visits, order of actions taken to transfer my son's sponsorship from me (his dad) to a private sponsor. I am leaving Qatar and my son has a job but is only on a 'freelance' contract which means his company do not offer a sponsorship or any benefits besides a modest salary. So, we need to transfer him from me (because I am leaving Qatar) to a private sponsor (so he can continue to work). I have reasearched this situation on Google and there is conflicting information and no exact matching of this situation mentioned.
Anyone been in this exact situuation? Any accurate advice, sources or even a reputable agency contact would be greatly useful. Thanks in advance. (we have a month to get this situation sorted out)
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