l am in eleventh grade studying here in U.A.E. l am planing to become a pilot in future. so l wanted to know:

-how and where can l start studying?
-what degrees do l have to have in school and college to be accepted for being a pilot?
-how do l join the aviation?
-what type of pilots do we have?
-which pilot has and can get the highest earning?
-how long will it take to become an airline pilot?
-which aviation club or school is the best in pilot tution internatonally?
-what stuff do l need to learn to become an Airline pilot Captain (highest rank)?
-which airline or companies like (UPS & DHL) offers the best?
-how do you join the company to start flying?
-which type of pilot is better airline or commercial pilot?

i like to know all about these and i will be really thankful for your help.

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To find salaries go to airlinepilotcentral.com

There r too many questions to answer all at once, but the important ones r those relating to getting started.
You can start studying any time u like but I'd recommend waiting until you're ready to actually start training - regulations change & books get updated. You will probably be required to have the most up-to-date & could end up having to buy books u already have!
Before u decide which school to attend, check out ur local airlines for scholarship deals.
Emirates has an ab-initio Pilot Program for Emirates Nationals. See the link below - this would probably be ur best bet!
If u r not a national, check other airlines for similar deals.
You do not HAVE to have any degree to fly, although it helps with some airlines, but remember that aviation is a constantly fluctuating job market & pilots r getting laid off & rehired constantly. A good degree will certainly help as a back-up in these times, the subject is not important - do what interests you.
As to whether airline or commercial flying is best, ur answer will be differant with every pilot u ask. Airlines (particularly smaller Regional ones), r notorious for furloughing (laying off) crews, whereas charter companies would be more reliable employers - but do u want to be sat at home waiting for a call to go to the airport at any time of night or day (which u could get with charter), or do u prefer a regular schedule & knowing everyday in advance when u have to fly (airlines)?
If u decide to pay for ur own training, start researching flight schools online. DO NOT pick one that asks for all ur money up front!
Some offer very good airline oriented courses including crew resourch management & even turbo-prop and/or some jet time. These tend to be much more expensive but often have guarantees of an airline interview (NOT A JOB!) at the end & could save u years of struggle later!
You may want to use the second link below to help u get started. (For schools in the USA only)

Good luck!

Salaries Of commercial Pilots (vary depending on the Airlines) In general are around 65K$ & some Health Benifits etc.