Am I a Donkey?

[SirFWALGMan]

I have just started playing PL08 and have a real hard time deciding if a draw is worth putting my money in or not. Here is a hand as an example. I am on the button and I have 2345. So I limp. The flop comes A5K. A player I know is good pushes in for $50. He has about $300. I have $100. I decide I have around 12 outs to win it all and 12 to split the pot. The probable hand I am up against is obviously AA or KK. I guess if I really thought this through I could have been up against something like AA23 which could have sucked. However I firmly though the guy had a set and did not want to split if a low hit.

So anyway, instead of just calling I decide to push and see what happens. The turn is a ten and the river is a 4. He had KK with no low draw and I end up scooping a huge pot. Is this the right kind of move to do or am I better off waiting for a made hand? How many outs is enough?