First job out of college (FP&A) and I'm stressed and nervous

I started my FP&A job last week, and I'm so confused and lost. The system I'm using (SAP Business Objects) seems overly complex in regards to running variances, reporting, and accruals. I can't seem to find good trainings. I want to knock this job out of the park and do well by the time I reach the 90 days. Any tips?