Hi there - welcome aboard and get ready for some SBG fun !
Here's some simpler suggestions to get you started. Go to the GW and/or Forge World Web sites and consider the following options ( I marked GW or FW next to each item)
Iron Hills - Dain Ironfoot, ft & mtd (FW) and Iron Hills War band consisting of 12 Warriors, plus 1 Captain and 1 Warrior with Banner (FW)
Lake Town - Bard the Bowman, ft & mtd (GW), Lake Town Guard War band consisting of 12 Lake Town Guard (GW) and/or the Lake Town Militia war band, consisting of 12 Lake Town Militia Warriors (GW)
Azog' Legions - Azog ft & mtd (GW), and Gundabad Orc Warband consisting of 12 Gundabad Orc Warriors (GW). You could also add in a pack of 3 Gundabad Bezerkers (FW).
All of these options give you great starting points, plus powerful heroes who are fun to use. One other big piece of advice that I'd give you is to start small and don't buy too much too soon. I'd bet 90% of the people reading this are nodding their heads right now, as almost all of us got into the game, got very excited and then bought way too much, way too soon. I've been collecting and painting for 4 years now and have painted up over 500 models, but....I still have another 500+ models sitting in my closet, waiting for their turn on the painting table - i.e, I have 4 years worth of models sitting in boxes and blister packs ! So...again, I would urge you to take your time and don't overbuy
Good luck....