Since this seems to be a trend here, I will also recommend <a href="http://www.makarov.com" target="_blank">Makarov.com</a> for all your Mak needs.
Though instead of purchasing the Ultimate Makarov Guide, I'd advise you to take a look at <a href="http://www.makarov.com/tech/assembly.html" target="_blank">this section</a> of Mak.com. It shows how to disassemble the pistol in language clear enough even for me to understand.
As for ammo, Dan sells green box Russian LVE FMJ for $100/1000 and $53/500 with $10 shipping west of the Mississippi river. I haven't shot any of it myself, but judging from the people at Mak.com's message board, it's excellent for target practice. He also sells Barnaul hollowpoint ammo for just a touch more.
Keep in mind that Barnaul is the only HP ammo known to feed reliably in Maks.