Help with US small business tax return.

I have a single member LLC in California, US. It is a new business. This is my first tax return. Tax filing deadline for US tax returns has already passed. I have already filed my extension. Now I need help with filing my 1040 and 2 separate Schedule C returns. I also need to make sure you understand how to amortize my start-up and organizational expenses. If things work out, I may stay with you for my quarterly filings. I use Xero for my bookkeeping.