Tinker's Construct is a good early-game starting mod for making good tools. Cool fun fact: right click with a pick in your hand and torches in either the next slot (or if your pick is slot 1, then torches in slot 0), you will place said torch. For this alone, TiCo is amazing.
From there, go cave diving for all the various resources. Then check out a tech mod. Either Thermal Expansion or EnderIO. Also try to get a Smeltery up for metallic tools. Once you've got basic ore doubling up and running, try something like Thaumcraft (Scan All The Things) or Botania. Botania, in particular, can be used to make some really useful trinkets.