Coolster3150DX2

I bought my first ATV(Coolster 3150DX2) back in February 2016 and built it with help. I also had help with emptying the "shipping oil" out and putting in a new bottle of 15w-40. So I warmed up the engine a few minutes and took off the 17mm and drained the oil and noticed a spring and strainer flew out into the drip pan. I have NO idea on what order they go back in. I watched several videos about it, all of them said that I made a mistake. Supposedly their are two size bolts down there, 14mm and 17mm. The 14mm shouldn't be touched, but I don't see any other bolt that is down there. Please help. I will attach a couple pictures.