what is the exact problem? could you show us pics of where things are going wrong? sometimes it is easier to cut oversized squares- draw a diagonal line- sew a scant 1/4" on each side of the line- then cut on the line-which gives you (2) 1/2 square triangles which you can then trim to the correct size....bias edges are often a problem for lots of people- even those of us who have been sewing for decades. there are many easy (beginner friendly) patterns out there- and generally adding extra rows of blocks or additional borders to get them from a queen to a king is fairly easy- just means making extra blocks or borders....anyway- show us some pictures of what is going on and someone will be able to help you out with this.