Welcome to the forum Tom, you're in a good place, Paper is ok to practise on. Get yourself a roll of lining paper from b&q or similar, lots of sprayable area to practise lines, dots and daggers. Get a colouring book for when you get bored of dots and daggers, colour in without going over the lines, this will help with control. Bristol Board is good and not too expensive once you get serious. If you fancy trying canvas, poundland has them and canvas coated boards and obviously they are a pound so not expensive. I've just got some yupo synthetic paper (polypropeline) it acts more like a hard surface and is very popular. Paint is a personal thing, i've just found my mixture for createx illustration paints so im using them at the moment. I use etac efx usually but have spectra-tex from Badger which i let the kids use for tshirts and general practise although its pretty good on most surfaces when you get it thinned correctly, im painting a motorbike themed painting with it at the moment. I've also got com-art, inspire solvent paints, tattoo ink, windsor and newton inks and trident. I have a few
You can get paint from lots of places Squishy has them covered above. There's a few things to get you started.
Lee