(Applicable only if you have the Get Famous EP) As I can’t tie Fame into the careers (yet!), you can check out some cheats here. You can use MC Command Center to promote your Sim (From a computer in-game, click Cheats>Career>Promote), or the cheat below if you don’t want to complete the objectives.
Here's a career I've been wanting to do for some time, but when MINEZ requested it HERE, it was time to actually create it! Hope you like it!