Starting out with orks can be pretty scary cause everything... I mean EVERYTHING in the ork codex can be the game changing uber unit. I suggest playing some ork games with a very basic army type (foot sloggas, Mech, etc) with only a few specialized units not overtaking all your points. Once you have a good grasp on things, Then start testing out the bikernobs and other super pricey things. Some guys you REALLY need to try (fell in love first time) are Snickrot and Zagstruck. Snickrot can move his komandos (and any attacked Independent characters) on from ANY table edge from reserve.

In love.
I liked the battle Report...

Orkses for Eva'