I lost most of items because i wasn´t online few months

I just login before few months not playing and I see only sword boots waist and wrist on me, few gold, talents reseted, no fly mount so I cant play now no gold to learn flying so I can go to ICC farm..what to do?

Start over?

yeah if this is only one solution I will must than...

You might also want to change your passwords and the like, since it sounds like someone accessed your account.

so if you can answer me one thing.how long I can be offline so I wont lose my items ?

You don't lose items from being offline. Read my previous post.

You should not lose anything for being offline unless your chars get deleted in inactivity cleanup.

If only gear and gold was lost someone else probably logged on the account. You mentioned mounts and flying skill. If you had those before but don't have them anymore then it's either some bug that deleted them or it's not the same char. Mounts and flying skill can not be deleted. Someone could have deleted and recreated the character, check level 80 achievements date to see if it's what it should be