It's actually pretty easy, but also depends how much you want to get into it. At the least, you need a mash tun (where the grain starches are converted to sugars using the grains' enzymes), a boil kettle, and a fermenter. So, a five-gallon cooler (~$20) with the spigot swapped out to a thru-fitting and a ball valve (about $10) for your mash tun, at least a five-gallon kettle (seven gallons would be best so you can boil a full volume of wort [unfermented beer] without having to add water at the end to top up), ~$50-70, and a glass five-gallon carboy will suffice as a fermenter (about $25). So, for an investment of about $150, you can build your brewery.
Of course, some people get a little more "involved"... haha
To build a beer, you can buy kits from online stores with everything you need included, or you can design your own recipe and buy the raw ingredients. For a five-gallon batch, a kit using malt extracts costs about $25, keeping your average cost per beer under 50 cents. Compare that to the $1.25-2.50 you can pay for a 12-ounce bottle in stores, and you can see the cost savings.
The most important recipe in any beer is good healthy yeast. The most important principle in the process of making beer is cleanliness. Abide by those two rules and you can make better beer than what you can buy in the store. If you can make a cup of coffee in the morning, you can brew your own beer at home.
Check out
www.morebeer.com and
www.northernbrewer.com for good shops. I'm not sure what's in Finland though for better shipping, but the UK has also grown substantially in homebrew shops and quality. And, if you want the best source of information, join the AHA (American Homebrew Association) at
www.homebrewersassociation.org. There are also a large number of forums you can find all over the place that have good discussions on how to start.