Also one thing you might not be aware of. Many beginner beer kits (eg Coopers, Muntons etc) call themselves lagers on the tin but actually come with an ale yeast. These beers are ales, not lagers. You can tell them apart by the fermentation temperature - a true lager is normally in the 10-15c range.
If this is your first beer brewed ever, I would strongly recommend starting with an ale. 99% of brewers start with ale and there is nothing wrong with ale. One of the big reasons for this is that ales are drinkable in less time, very important for the first brew. If you like the taste of lager then buy a "lager" canned kit which is actually an ale yeast, the taste is similar enough but without the extra hassle and risk of brewing a true lager.