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Wow... you've gone for it there pal....I'm impressed.Think you’ll struggle without the use of a welder.
you really need to cut a hole in the outer skin, fix the inner (which realistically would mean getting an inner wing repair panel as the shape is pretty complicated) fixing that and then welding the outer, which again looks like you may be better off with a panel
something like this
Check out car body panels for you,
Check out car
Check out car panels direct, I will be getting my panels from them eventually!
https://www.carbodypanels4u.co.uk/vauxhall/astra/vauxhall-astra-5-door-hatchback-1994-1997, sorry this was the website I meant to send you, I need inner and outer rear arches on both sides, so I think your panel will be a lot cheaper!