Hi Aliya,
The areas you are looking for are comletely developed, but there are some available in Dubai Marina these are not compleletly offplan but you can purchase by paying premium + the paid amount (mostly upto 40% to 60%) and the rest of the payment through installments uptill completion, most of the projects are still under construction and the completion takes more than one year, so you will be having enough time to repay, for the complete off plan projects Jumairah Village South and in Sports City and ofcourse in Dubai Land Projects are available.