Thanks for all your help, I've tried some poker with friends for fun lately (without betting any real money) and your advice seems to make things easier.

By the way, just one random question:
what's the name of that poker game where you get five cards and choose which ones to keep, then get the other cards replaced?
I know you can play it as a mini-game in Dragon Warrior 4 and I also know it is an extremely common type of poker, but what is it called again?
Also do you have any advice for those kinds of poker games that you play alone - like that game and Blackjack, for instance?