Vincinia
Make him learn occulemency and leglimency and learn martial arts. maybe copy knowledge from muggle university professors? Work on poison resistance by eating small amounts in food. work out from very ealry age to get very athletic body. eat protein and testosterone rich foods to promote growth. Use nutrient potions with muggle vitamins. also when mcgonagall visits you youll need a gaurdian. maybe find a rich millionaire war veteran and use compulsion to make yourself a rich muggleborn with that background. steal momey from gangs, banks but also gold from federal reserve. or accio nazi gold? Treasures from ship wrecks like titanics? Accio diamonds ir gold from muggle mines? imperio a soldier or agent in mi5 to train you. be like batman make a secret hideout and base maybe build a magical AI figure out how to use electricity with magic. gins with expansion charms for ammo and silencing runes? get you house elf to assassinate gangs and take their money that way? Or take control of london as a crime boss with rich muggle father. good luck