Opel Astra tuning costs?

Hi, I'm getting my father's car (Opel Astra g) in the next 2 years.

I think it's very nice but I thought that if I do an apprenticeship and he gives me an additional €1,000 a month, I could save up enough to improve the bodywork every three months, like lowering the front or sides, a spoiler, different lights, cool air intakes on the hood, etc.

Unfortunately, I have little idea how this works because I've never had a car before.

I discovered a lot of nice pictures on the internet that I like; I would tune my car like that.

[I show a few pictures of what I like]

>Without the double doors<

Please give me information and advice on how to do this well and plan it… and how much it all costs on average.

Will this also mean more insurance costs for me?

Thank you:)