It becomes the same as a job when you do that. I know people who just sit there, playing for hours and they finish off with a $20/$30 profit. If you do it every day then it does add up, but as I say, it becomes a job and if you think about it, it's a bad job - 5 hours to make $30, that's just 6 bucks an hour and you are not even guaranteed your pay !! I load up £50 into an account with one of the big UK bookmakers who has a link into a popular site and just play until I get bored. Sometimes I win, sometimes I lose but I see it as just a bit of fun.
As for learning, best thing I can advise Nicke, is learn the sequence of the hands first, as I have sat down at tables before (with mates) where I've had to write down the order of winning hands, i.e. what hand beats what. Then after that, just play to your hand. Once you've got the hang of the hands and start to realise how often (or not) some hands come up, then you can start playing agasinst the table (i,e. other players). Start off with 5 or 7 card stud, avoid the games like omaha hold'em and texas hold'em as they require a bit more knowledge of the game, as there are cards laid on the table which are used by all players to make up hands. Here you really need to know what the possibilities are that are available to other players on the table.
For example, if there's 2 sixes a king a jack and a ten on the table, then don't think that you automatically have the winning hand just because you are holding a six (give you three of a kind with 6's), as another player could have a pair of kings jacks or tens, which means they have a better three-of-a-kind hand. Another player could have the fourth six and a king, giving him a full house and a winning ahnd !!! Too much for a beginner to cope with, so I suggest poker when you get cards dealt to you and they are yours alone, i.e. they only count for your hand. A table of say four players, you all get 5 cards face down, you look at the cards and only you know what you've got then you bet according to what you have in the hope that you have the winning hand.
What can be fun, is to play for pennies with a few mates, or even buy a kid's game with different coloured counters and use them as "chips". This means you can have some fun playing, without money becoming an issue or at worst, losing friends because you keep winning all their money
Have fun
Diz