THe easiest and least expensive is to use a canned kit.
They have done all the boiling and hopping for you.
The basic instructions are to dissolve the contents of the can in hot water, add 1kg of corn sugar, then fill your primary to 6 gallons with cool water. Pitch the yeast cover and let brew.
When it's clear, you bottle, adding 1/2 tsp of sugar to each bottle and cap with a beer cap. (no wine bottles). 2 weeks in a warm place to carbonate, chill, get drunk, repeat...
If you replace some or all of the corn sugar with Dry Malt Extract, and transfer to a secondary fermenter after 4 or 5 days, things will turn out better.
When racking, you need to be as gentle as possible and avoid splashing or aerating your beer. It oxydizes really easily.
Bottling gets old really fast, and a kegging system with forced carbonation is the way to go.
I've had good luck with muntons, Cooper's, Morgan's, Canadian adventure, and Beer maker's choice brands. I wasn't impressed by the baron's kit that looks like a boxed wine kit.
Be certain to check the expiry date before you buy one. If it's even close, pass on it.
Although most come with ale yeast, there are some that have hybrid strains that do give lager characteristics when brewed at lower temps. Coopers is one brand that has reccomends lower temps for lager kits.
The technology is evolving and improving. Most people who badmouth these kits probably havent made one in the last few years, or last made one as a beginner before they really got a handle on good brewing and sanitation techniques.
It's nice to be able to start a batch in 10 minutes instead of needing a whole day to brew.
For a coors light type, try a Munton's blonde or morgan's canadian blonde.
Shelf life can be 1 year, depending on your level of sanitation and storage conditions.