The 17-year-old joins the Lambs from Truro City, promoted back to the Vanarama National League South as Southern Premier Division South play-off winners.
Newton represented the White Tigers at under-18 and reserve level.
Henderson said: “Callum Davenport and myself have watched George several times over the last season, and again in a cup final at the weekend.
“He is one of the brightest prospects in local football. And despite George only just turning 18 in August, he has huge potential, and I believe he can challenge for a starting place in the Southern League next season.
“George is in great physical condition and his fitness and athleticism is a key factor in his game. He can play both off the left and the right and is a really exciting player in the final third and I am excited for Lambs supporters to see him in pre-season”.
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