I applied for H1-B visa on April 2007 and the petition was approved from October 2007 to 26Th of September 2010 but when I came to USA consulate office to get the visa it became pending putting under administrative processing. It took almost 3 years to get the reconfirmation and last week I received the visa.
The visa issuing date is 27Th May and the expiry date is 24Th August but there is another date in bottom right part of it as PED : 26 September 2010 which is my petition's expiry date.
Now I am planning to move to USA for a long term stay so that I am selling my stuff, renting my house,.. and I just got confused by considering this date.Does this mean my visa will be expire on September and my H1 visa is just for some months? In this case does this mean I have lost 3 years of the total 6 years of the H1 visa? or the the officer issuing the visa on I-94 form in the ports of entry can issue the visa for 3 years as a normal H1-B visa?

I have arranged with my employer to start the job on 10Th of July and I will enter USA on 8Th, so up to 26Th of September which is the PED date will be less than 3 months and if the white I-94 card that will be in my passport should correspond with the expiration of the petition, the total of my work duration, will be less than 3 months which really doesn't make sense at all but as it seems that's it!

It seems now the only way is to apply for H1-b extension. So there will be these questions:

1- how will be the process and how much are the fees?
2- How long does it take?
3- Do I have to go back to my home country to get the new stamp for extension?
4- Is there any way to renew it in USA ?
5- Is 2.5 months of work enough to apply for extension? or I have to come sooner if it is really necessary.
6- In my first interview on 2007 they got all the original documents from me and never return them back to me. should I ask for duplication?
7- Is there anything else that my employer and I should know and consider?

I have to know the answers to these questions, first to arrange with employer and to see if they are interested and also to decide about our stuff, jobs, properties,... in my home country before entring the USA, otherwise it can be the loose of everything for us.
Please help me