Notes on familiar and polite forms:

Like in old English the Russian language still uses two variants for the
word "you" and "your" and it is important to remember both forms because when
addressing a Russian person who is older than you or more distinguished than
you or a stranger then you must use the "polite" form of you:  "vee" (вы).

When addressing friends, relatives or children/teenagers then it is better
to use the "familiar" form of you: "tee" (ты).

Notes on cases:

The most difficult and stressfull aspect of the Russian language is
undoubtedly the many cases which cause the endings of nouns to change and
causes pronouns to change almost completely depending on which of the
six cases is in operation. In English we just have the cases "accusative
and nominative". In Russian the six cases are:

Nominative:  	(Eg: HE went swimming).
Accusative:  	(Eg: The ball hit HIM).
Genitive:	(Eg: I told HIM it already.
Dative:		(Not really sure, maybe something to do with time).
Instrumental: 	(Eg: the cat walked with HIM).
Prepositional: 	(god knows what this case means).

For example look at the following 3 Russian sentences and see how the word 
for "he" changes radically depending on how it is used in the sentence:

He can play tennis.
он может играть в теннис.
on mojyet eegrat f tyenees.

she is waiting for him.
она ждет его.
ana jhdyot yevo.

I will walk with him.
Я буду идти с ним.
ya boodoo eetee c neem.