There is no real fun way to play slots, as ultimately most players will lose money on them and that of course isn't fun at all.
If you don't have lots of money you are willing to lose, then, it's more about, getting the best value for your money.
For that, it means playing low stakes on slots that have a low variance i.e. slots that don't generally go on medium or long runs of no winning spins. Yes you don't win as much, although it's still possible to win 200x + of your stake in free spin rounds.
Find slots that have bonus and free spin rounds that you enjoy.
Offers/promotions and general bonuses, can be another good way of not risking too much money, but still having a large enough balance to start with, to get hours and hours of game play for your money.
For that, study the site and forums here and look at what casinos people are playing at and bonuses that they are taking. You'll notice with some bonuses, many will say they have achieved a cash out and and some where hardly anybody has managed to cash out.
Don't go into playing slots, without doing research on casinos and the type of slots available, again strangely this site is probably the best place to do that
Finally definitely, set yourself, a certain amount you are willing to lose and a certain amount if you get up to, you'll cash out with.