Welcome!
In my blob I tend to use 5w40 (as recommended by Opie oils, there’s a discount code for the club on the forum somewhere). I go for millers purely due it to it being a very good price and I keep my oils changes frequent.
Spark plugs should be PFR6B
Id refer to Opie oils again for your transmission oil. With your brake fluid, it largely depends on what you’re going to be using the car for, road/track/mixture of the two.
Personally, I use Mahle oil filters. Air filters, stick to to panel, k&n and cosworth offer nice upgrades for these.
Obviously this applies if you’re running standard, if you’re staring to add power and performance upgrades, these things start to change.