Deciding on the kind of pool PPS or PPLNS, depends on what kind of person you are.
If you want to be fair to yourself and the members mining in your pool you will want a PPS and more hashing power than any other member so you can make money as well. (you will need a lot more than a GPU rig) You take your hashing power and split it up 25% for the pool itself and 75% for you. that way the pool has an income of 25% of your mining potential. I advise if you decide to go PPS you should have a minimum of 2 PHS of mining power dedicated for your own pool.
If you want to be a greedy profit hog you can do the PPLNS pool. PPLNS pools even ones that say 0% fee makes a lot more than they are willing to admit to anyone. they are the most profitable mining pools in existence, if they were not hugely profitable pools sites like CEX would not use them

To be honest no one would use them. if you watched the pools and all the history of mining pools you will see it was a mojnkey see monkey do research and development experiment. they started out as PPS, and tried PPP (paid per porpotion) then along comes this new PPLNS system with a calculation that confuses even rocket scientists. And the more pools that tried it the more pool owners realized how much profit really was in a PPLNS pool. A PPLNS pool also gives the owner the ability to have absolutely no mining hardware at all and still make a fortune on his pool. The bottom line about a PPLNS pool is its a pool that keeps people from making good enough profits to use the ROI and gt more equipment, (This is now an opinion of mine) I think after all the research the big time pools realized a good PPS system makes it easy for people to make a good ROI which would lead to them getting enough equipment to open their own pool or start solomining. ASt tha time they had 1% to 5% fees to mine in a pool, so they came up with this PPLNS system that guarantees the pool owners make a HUGE profit compared to the miners mining there.
So if your 2 choices are PPS or PPLNS the decision is simple do you want to be fair and ethical and work hard with a good investment PPS, do you want to be a btc hungry, greedy unethical pool like most others out there PPLNS.
Also welcome to the forum please ignore responses like Aurel, to answer you like he did was a bit rude and just not nice on his part, maybe he does not understand the purpose of forums is to help others understand things they are confused about. To aid people when they are in need and help us all progress forward as a group. His answer was both rude and absolutely useless as well as off-topic. Altho some of your questions could easily been answered, i dont think his response was the best way to approach you as a new member and all.