You should consider an upgrade to 7.1.2/7.1.3 (depends on components) before performing an upgrade to 9.x (9.5 or 9.6 preferred).
9.0 is quite difficult at certain points wich have been solved by 9.5+.
For the deprecated services I agree with Mahesh.
You should also take a look at the migration Guides.
Depending on the size of your application and the number of used components (IS, BPM, CAF, Adapters, …) you will have to read a lot of documentation.
Regards,
Holger
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