Cooking advice

Hello everyone, I'm hoping I can get some help from specifically British Pakistani Muslims if anyone is willing.

My daughter's boyfriend is coming for tea soon and whilst I have a a basic understanding of "Halal" when it comes to meat I'm absolutely clueless when it comes to other common household ingredients.

I plan on making a salmon dish for us all but I'm unsure about oil, seasonings, butter. If I make a potato dos I'd likely use cream or milk and I'm unsure about that as well.

So I know this is quite vague, but, in a typical British kitchen, are there any common ingredients that I should avoid?

Extra points if someone can give me a fancy Pakistani fish dish dish with sidesI can try to make.

Thanks in advance for any help.