But I guess if you're wanting to start small...you could pick up a Mr. Beer kit. I think those things are less than 2 gallons.
They can actually hold a 2.5 gallon batch of beer. I know since I use them in some of my small batch brewing. About 45-50 percent of my brewing is in 2.5 gallon batches. That's why I know there's a lot of info and recipes, and hints and tips for doing them on here,
I've posted quite a lot of it.
It may not be many of your cups of tea, but it is mine, and several others on here. I don't think of any aspect of this HOBBY as work...whether I'm making 5 gallons of 2.5, I'm still making beer and I am having fun...
I do quite a lot of them, for several reasons....to test recipes. To make things that I know I won't want to drink 5 gallons of. To do small partigyles (two, 2.5 gallon batches can be done easlily out of a 5 gallon cooler.)
And also because I can do full volume boils on my electric stove with only needing a five gallon pot. And to help teach Mr Beer users how to make kick ass beers in their old brown kegs. You can also lager in a Mr Beer kegger, or squat 3 gal water bottle in a standard fridge without needing a second dedicated, and still leave room for the milk and beer, which is good for me since I live in a loft with little extra space.
It's also a good way to get introduced to AG without a huge expenditure of equipment. You can make a low to moderate grav 2.5 gallon batch of all grain in a 2-3 gallon unmodified cooler. (10 bucks @ Walmarts) And you can get surprisingly good efficiency from the unmodified cooler, with a folding steamer and a grainbag...
I put a whole tutorial on THAT subject in the mr beer thread...And hopefully soon in BYO.
Plus you can brew 2.5 gallons of AG for about 9-10 bucks (Not counting yeast)...1 ounce of hops goes a looooong way in a 2.5 gallon recipe.
This summer I had 4 or 5 different small batches going plus 3-4 regular 5 gallon batches of my 'haus standards" (My Amber, My Dead Guy Clone, My Brown Ale, and My Ginger Orange Dortmunder.) I had a Hellova variety of beer.
I use 3 gallon water bottles for the majority of my 2.5 gallon batches. But you CAN use a 5 gallon as a primary...If your recipe calls for a lot of fermentables and therefore may be really active, doing it in a 5 gallon prevents the need to use a blowoff tube.
I've not noticed a problem in any of the small batches I've made with HOP UTILIZATION...but then again I use beersmith's scaling feature...but I always double check the ibu's...I make a note of it @ 5 gallons...and if it's not the same at 2.5 I tweak til I get it...same with gravity and color...
It's not off that much...
It's not really all that difficult...if it's a 1.060 SG beer with 25 Ibus and 20srms at 5 gallons then it should STILL be 1.060, 25, 20 at 2.5 gallons as well...
BUT I know from experience with tweaking small batches, it is easier to calculate the hop quanities in grams rather that ounces...if it comes out as .3875 ounces that MAY be kinda hard to measure, even on my digital scale...but converted to grams it's fine.
.3875 ounces = 10.9854402 grams...so I'd round it to 11 grams...
(But like I said, there's a ton of info in here if you want to do it..heck this post was simply a cut an paste of 2 of the answers I've given in some of the treads.)