Get it serviced first and they will show you how to use it properly. Please don't try it first, because there might be birds etc up the chimney or it might be blocked by dirt.
There would be a DIY option on collecting firewood, drying and storing but I have no knowledge of this.
We use the easy option:
We use kindling to start the fire : you can buy small bags of these from garden centres or some supermarkets.
You can use newspaper or firefighters (also available to buy from various places, small cubes of I don't know what, you can get non smelly varieties but they have a fuel in it so there is still some smell) to get it started.
You can also order fire logs. Find a local supplier or look online. We use a local supplier and two websites White Horse Energy and Luxury Woods. You get the wood in nets or crates. Crates are more cost effective. You'd need a sheltered storage space. Price has gone up last week (expected). I followed it because I managed to order just before price increase and kept an eye on it whilst waiting for stock to come in.
We use kiln dried wood but I think seasoned wood is also OK and a bit cheaper.
We only use oak as it's supposed to be longest lasting for maximum benefit but you can also use mixed hardwood for a slightly cheaper alternative.
There are the odd exotic hardwoods available by the net, supposedly better as it's a denser wood but these are more expensive and probably aimed to be used with smokers. I only tried olive so far and couldn't stand the smell and I'm not sure there will be any other experiments.
You also need some tools, look online or garden centres, a million options all down to aesthetic preferences and cost. But you want good quality stuff, to last a very long time.
Don't buy any if the above from petrol stations: very poor quality, not dried properly.
There will be a degree of trial and error until you learn how to use it.
Enjoy!