Do you mean ground coffee? How are you going to be making it, in a cafetiere for example (it's a cheap option for a beginner)? Are you going to be buying ready ground or do you plan to go the whole hog and grind the beans yourself?
I'd say buy a cafetiere for a start and you can get a good quality one with BS heat resistant glass cheaply and easily from Wilkinsons, single mug size about £3, 3-5 mug size about five or six quid, or a single mug one without the certified glass from a 99p store.
I think that the permanent plastic framed filters on the 99p ones are better than the all metal ones that you have to take apart in the expensive ones (and they're the same size) so look out for this type of filter. You'll need to rinse out the filter in cold water after every brew so the easier it is to do the better.
If you've got a B&M store near you then they frequently have expensive and unusual ground coffee blends going cheap, and these will give you the opportunity to taste good coffee for a small outlay whilst you get aquainted with the different flavours. The packets will say on a panel somewhere the origin of the beans, what the characteristics of the coffee are and the flavours they produce. The book below will guide you much better than me.
In both B&M and Home Bargains they continuously stock small bags of Lyons ground coffee for cafetieres for 59p I think. I should explain that different methods of brewing the coffee use different grinds of the beans, some more coarse than others. There's a rich, dark, and strong after dinner type with a red label and a milder all day coffee with a green label. Try one of each and take it from there.
Coffees are measured in strengths, 1 through to 5, getting stronger and more intense on the way up. People tend to call the strength 5 ones 'after dinner' and a strength 3-4 as a morning coffee and a strength 2 or 3 an all-day coffee. Different countries produce different types of beans with distinct individual flavours and aromas, the more highly prized of which will cost (relatively) a lot of money to buy...and it must be fresh, that's important.
When I first started buying ground coffee way back in 1990 I bought a lighthearted and informative book that was a great help and I was fortunate to live near to a an old family firm specialist coffee grinder who taught me a lot about the beans. There's some delicious coffees that you can buy online now, if there isn't a good grinder handy for you, as far removed from instant coffee as the earth is from the sun.
The book I mentioned is Coffee by Claudia Roden. You can buy a good used one from Amazon for £2.81:
http://www.amazon.co.uk/Coffee-Claud...a+roden+coffee