Privyet Comrade, where to start. E&l make some pretty awesome Aks. Ak74 is the best platform for a Russian loadout as you can use it for many different loadouts. You can buy E&l fairly cheap on Gunfire.Pl if you go for a brand called Forcecore they are basically rebranded e&l Gen1s with a standard motor, so absolutely solid. Do you know what era you want to base your loadout on?
Have you been on the Russian loadouts UK page on Facebook yet? Pretty good advise to start from on that page. Many places to buy Russian kit from but you'll generally always have to import from Russia. It usually takes around 3-4 weeks for Russian post to arrive.