The rolls have stated that I need to start with a couple (4-6), I need 2 children (3-6). 

I get money by dumpster diving -   [50) Dumpster Diver- One Sim's trash is another's Sim's primary source of income. Dive into dumpsters to find items to sell (added with patch 1.50). If your Sim has the Slob trait, they may also rummage through the neighbors' garbage pails for saleable items. If you have the Ambitions expansion, this sim may sell scrap found by digging through junk piles at the junkyard.]

my heir needs to be a 5 star celebrity before the next heir can start [9) 5 Star Celebrity - Your heir must become a household name and obtain a glittering 5 star celebrity status. (Only the heir needs to do this, not spouse or other family members.)]

and as for miscellaneous fun, the children must be half siblings.  [8) Half-Siblings - No two pregnancies or individual adoptions this generation may be with the same partner. Re-roll if you only need one child. Note that you can have half-siblings at any time in the legacy; this roll only forces you to do so.]