Daycare/separation

So my son is almost 13 months and I've stayed home with him since birth. I'm looking into going back to work soon, no specific timeframe really. He's been dealing with separation anxiety when we leave him in child care during church or when we leave a room or go to the bathroom. I know this is all normal and it affects some toddlers more than others but is there anything I can do to help ease it? I'm so nervous to leave him all day. We don't ever leave him with anyone. I know he needs to learn more and be socialized. How am I going to deal with leaving him? What if he cries all day long? How long until he gets used to being dropped off at daycare? Any advice would be great! ☺️💗