My starting routine is the same as vanilla for the most part. Wander around until I find a spot I want to live at. Gather as much wood as possible the first day there. Start digging down switching to stone tools on the way. Find 3 or 4 iron then find lava. Make a Nether portal. Go get Netherrack, NetherBrick, Glowstone, Blaze Rods, Soul Sand and Netherwart and if lucky magma cream then head back to the overworld.
Then I start on the Mod stuff. Make wheat, corn, flax farm and possible potato farm if I ran across a village. Place some bog earth to cure. Head down to lvl 12 and start branch mining until I get 11 diamond and stopping up at copper level on the way out. Make a pulverizer and a peat engine. Start on biomass production(peat engine is for powering the pulverizer). Make quarry and biogas engines and let that run.