A lot of different questions from a new player...

[Niwashi]

3- When you died, is there any negative impact? I know that you must travel back to where you were, but is there any other impact?

Nothing major, but it causes some extra damage to your equipment.

4- When playing conjurer (PS4), is there a way to have to option to target only two-three creatures? What I mean is this. I play a low level conjurer with my friend. I want to focus on him and the monster. Attack a little bit the monster...heal my friend and keep this patern. However, when I change the target, I often have problem to got back to the last target. So, if another player is in the way, my target will go on him. However, I dont want that. I want to be able to target my friend and the monster easely, without fumble....

If you're in a party with your friend, the up/down arrows on the controller can switch your target amongst different players in your party. Then use left-right to target enemies.

5- Every gear I got have to color line. One seem to be the condition of the gear. What is the other?

It's the percent of SpiritBond. Once your spiritbond reaches 100%, the item is able to be converted into Materia (if that item type can be converted at all, some can't).

6- I just got my chocobo. How can you personalise it? Can you buy gear at store? Is there store that sell only chocobo gear?

Some chocobo gear can be bought from your Grand Company in exchange for GC seals. You may have to rank up in the GC first before those become available, though. There is also sometimes special gear made avialable just during seasonal events.

7- Why cant you put every item you want on the selling board? What are the conditions that made a item ok to sell or not?

There's two conditions that will prevent you from being able to sell an item. One is if the item is marked as "Untradeable" which means that particular type of item is something important enough that SE wants each character to have to earn or get for themselves, and not purchase from another player who had earned it.

The other reason is if the item is Bound to you. Once you use or wear a weapon, tool, or armour piece in combat or crafting, it becomes bound to you and you can no longer trade it to other players.

9- What are the benefits to have a house? What more can you do?

Mainly it's a place you can decorate as you like, hang out at and call your own. But you can also have a garden there to grow crops, and a chocobo stable which can help your chocobo companion level up.

10- Since I am new to MMO, its hard for me to understand the fishing or cooking class. Can someone go from 1-50 just by fishing? What is the purpose of this kind of class?

Each class has its own level, so yes, you can take the Fisherman class from level 1-50, but that won't affect your level as a Gladiator. The purpose of fishing is mainly to acquire the fish that Culinarians use as ingredients to craft food items. (A few fish are used by other crafting classes as well, but it's mostly culinarians.)

11- Somethimes, a creature put a Template in front of him to make a attack. If you move off the Template and go behind him, are you still hurt? Is this a auto hit?

The colored area shows where an AoE (Area of Effect) attack is about to land. Anyone within that area when the attack completes will take damage from it. Sometimes it's just in front of the mob readying the attack, sometimes it's a circle all around them, but to avoid the attack you just have to move out of the marked area by the time it completes. (So yes, if it's the type that extends out in front of the mob, then moving behind it keeps you safe.)