As an experienced GM, im not going to tell you how to run your games, and i'm certain you already know all about calculating APL to create encounters of appropriate CR.
My advice? I'd say go with encounters you think the group should be able to handle easily. Take note as to whether or not they struggle, and throttle the rest of your encounters accordingly. Take note if Undead are especially difficult for them to deal with. How about against a regular front line fighter? Oh, and make sure they dont come across any opposing adventuring parties. Because you know its 2 rats and kobold according to the games ives GM'd that basis for murder and mass looting. God forbid anything those 3 wear shines. :)
Anyways im rambling,
TL;DR
Take it easy so you dont start with a TPK, and make it harder as you go.
P.S
Good photo choice. :)