One very useful tip for sewing is to under-stitch when sewing a garment with lining. Under-stitching is used to hold down your lining so that it does not show and also to make the seam less bulky. This technique is often used on necklines. After connecting the lining to the main fabric, iron the seam and then turn the seam allowance so that it lies under the lining piece.
Next, sew the lining to the seam allowance an 1/8 inch away from your seam. Make sure that you only sew the lining and the seam allowance together, not the main fabric. (I used white thread so you could see it easily but a matching thread would be best)
When you are finished sewing press your lining.
When this is done you will have a beautiful neckline with no lining showing on the outside.