Neglected bike

I haven't run my bike Honda CRF1100 in over a year and some change. Closer to 2 years. What are the key things I need to do before starting it up. I've taken care of the battery and chain and tires. Should I dump the oil before even starting? Gas? Trailer to a shop and just get a full once over?

Apologies for stupid question.

Before you ask life got in the way and now I'm getting back into riding.