i grew a camelia very successfully in neutral soil in semi-shade. Found out the hard way that they don't like being moved.

They need ericaecous soil, like Rhododendrons and azaleas

If your soil is not acid and you really want to grow camellias, your best option is to plant it in a large pot filled with ericaceous compost. You'll need to look after it more than if it were in the ground as it's dependent on you long term for water and feeding.

My experience with them is that they like excellent drainage, too. They need at least moderate moisture, but it is easy to drown them if you have clay soil, or a tight potting compost.