Problems/ Challenges:
1. Difficult place where no institute for SAP trainings
2. Need to get started with SAP FI Certification alongside continue work, so confusions how to and where to start from
3. Access only to open hub and sap easy access system (i suppose)
Solutions:
For challenge 1 and 2:
As there is no SAP institute, there can be two scenarios to answer how you can write your certification exam. But as a matter of fact, as you wish to complete the certification program and get certified along side job which is no doubt a good idea, this can be a tedious effort in your scenario as you are just a beginner and into a job , kindly note: i am not at all discouraging you but sharing you the facts.
I am also worried where would you be able to write your certification exam. So the two scenarios can be:
1. The company in which you are working will train you in SAP FI and make you work, and thus after a year they will allow you to write certification exam, at that time you dont need to pay the course fees just the exam fees. But as you are on contract i am not sure if this facility will be applicable for you. You need to clear all the ins and outs at your end.
2. You can go to https://training.sap.com/shop/ and select the country from which you can write your certification or call SAP in the given number or mail them in education.germany@sap.com, to gain more information on this.
But in my suggestion, i would say this first year just learn learn and learn, once you have gained sufficient knowledge, it will be easy for you to clear the certification anytime. And as you told, you would like to finsih off the contract and start for UAE, there you have multiple provitions of appearing the certification exam directly, which you can avail anytime. Also, you are right UAE has got a superb SAP market. Many Indians are working in middle east infact I am interesed too, but not getting right opportunity as of now, so waiting for it 
So focus on learning materials and all the concepts. Deal with certification materials available in the net and all other reference materials and go on learning with out enrolling into certification program by investing money at the moment.
Since into job of 8 hours(i guess), you need to spend 6 hours daily religiously in reading the materials. I will also suggest you how you can practice at your home. Also, i am sure that the contract is extendable and those who perform well, company is going to retain them for long. So the company is training its resources so that they can contribute during implementation of SAP. So the company must have demo systems called Sand box for practice which you can make use all the time. And additionally if you want to practice at home, you can download the SAP GUI here free: Downloads and install it in your laptop and connect to any service providers at your place who gives access to SAP Servers. Configure the GUI and go on practicing. You will just need internet connection and monthly rental payment for the SAP Server Access.
Now you may be wondering where to start from:
Well, the certification has each book codes as you can see like: TFIN50, TERP20, TFIN52, AC201, SM001E, TERP01. You can look for them in the internet for downloads i am sure you will get them, which may be of older versions but surely will be delivering the concepts and will be useful thus. you can use scribd.com for the downloads. After you are done with collecting materials get started reading them and practicing. Invest as much time as you can.
Also you have Open Hub and along side OpenSAP certification training material(See below), these collectively will be sufficient to get you started.
For challenge 3:
As you have access to open hub for learning, that is really handy must say. Also you can try https:// www.opensap.com Here you can have your OpenSAP FI certification without investing a single penny. Just regularly attend the course after registering yourself and appear the exam. You can also opt for multiple certifications and there are no limitations. This much appreciated initiative has been taken by SAP education to remote places or the places where no SAP institutes are available.
Any thing you want more to know feel free to ask. okay.. 
Also If more info and help you need i will introduce you to SAP FI expert here in SCN and you can have many sound suggestions. So nothing to worry atall.
OH ONE IMPORTANT NOTE:
Please move the thread in Career Center space. You have posted it in wrong space. On right side you will see Edit link below which Move. Click on that and select the correct space as i said. okay?
Cheers.. Aparajit