for how many years must all men in Russia need to serve in the army ? how big is the Russian army and army ranks ranges.

2 years of a compulsory service.

The newly reemergent Russia retained most of the ranks of the Soviet Army with some minor changes.
The principal difference from the usual Western style is some variation in generals' rank titles, in one case at least, Colonel General, derived from German usage.
Most of the rank names were borrowed from existing German/Prussian, French, English, Dutch and Polish ranks upon the formation of Russian regular army in the late 1600s, and have lasted with few changes of title through the Soviet period.

Russian army does they have them, 2 years of a compulsory service even now ?

Even now, yes.

Its really a new news for me that there is a compulsory term with the Russian army and its strict, anyway thanks for the information.