From: Henry Grumiaux
1) First Question: Where is the differences bw buy from LindenLabs or buy from someone that' s owned a island ?
I know that LindenLabs requires Premium Account.Wanna get more things about.Details.
If you buy from Linden Labs, you will buy on the mainland and pay a monthly fee to Linden Labs. Your land will be standard in every way. There is no zoning so you may have neighbours who can place anything they wish directly next to the land border.
If you buy on an island, you will almost certainly still have to pay a monthly fee, except it will be to the island owner (because the island owner has to pay a monthly fee to Linden Labs for the island, and they need to make it back somehow). The island owner may offer bonuses such as better terraforming or extra prims. The island owner can claim the land back at any time so make sure you trust them. Most island owners will zone their islands, but check before buying.
You pay the "tier fee" each month, plus a Premium membership fee that can be paid monthly, quaterly, or yearly. There is no "covenant fee" - that may be a term that an island owner would use, though.
From: someone
3) If I aquire a land parcel of someone that's owned de island.Can I put the parcel for rent ? And if I get from LindenLabs ? I Can ?
If from Linden Labs, yes. If from an island owner you will need to ask the island owner.
From: someone
4) What's the "Class 5" Server means ? Is it the maixum class ? Class canbe sorted as 1,2,3,4,5 ? With kind of concept is this ?
This is a measure of how advanced the server at Linden Labs that runs the region is. Class 5 is the highest and fastest, Class 4 is slightly slower. There should be no class 1-3 regions left any more.
From: someone
5) I saw some lands to sale.There is a field data named "Trafic".What it means ? With number is good and with number is no good ?
"Traffic" is a measure of how many people visit that area. This can be a measure for how many people are in that area which may be relevant if you are thinking of putting up a mall or something similar.
From: someone
6) Can I play streaming content such as Web-Radio on my parcel ? If yes: Is my content spread to the others parcels pissing my neighboors ?
Yes, and no.
From: someone
7) What exactlly causes a region a need for restarting ?
Usually technical problems with the server, excessive lag, or certain abnormal script behaviour.
From: someone

Assuming that I get a land with 2048sqr and this is my 1st land.My fee will be something bw 8 usd and 15 usd, right ? And my purchase ? I will get a rebate of 1/4 cuz I won 512sqr when I upgraded my account.Does it correct ?
No. Your premium account gives you 512sqm. If you own a total of 2048sqm, you are using 1536 extra sqm. The fee of US$8 is for "up to 1024 extra sqm" and you are not in that category, so you pay US$15 for "up to 2048 extra sqm". There is no refund for not using all the available land. That's why they're called tier fees - they go up in tiers.

From: someone
9) With kind of risks may I'm running if I bought a land from someone that's owned the land ? Can the guy increase in 300% the convenance tax if him wish ? Can the guy take my land whatever him want ?
Yes and yes. You must ensure you trust any island owner you deal with.
From: someone
11) If I get my land from lindenlabs and give up to pay the monthly fee or/and pay the premium account fee I will loose my land ? Can I be refunded ? And if I buy from someone that's owned the land ?
Yes you will lose the land and get no refund. An island owner will usually have the same terms.
From: someone
12) If I got a parcel of 4096sql and wanna put it for rent.How can I put this on land sales result search ? Have any coasts ?
You cannot put rental land on the Land Sales result search unless you are an island owner and even then you aren't really supposed to.
From: someone
13) If I got a parcel for commercial purposes.How can I do for my "store" appear on search results ? Does it have any coasts ? I saw several "stores" that's appear on several search results how.How It's possible ?
It's an option on the About Land dialog and costs a few L$ every week. If you are a Premium user your Premium Stipend will cancel out this cost and more. If you want to appear several times you can cut your store into several different land parcels and put each of them into Search, although the cost will increase as appropriate.