Scratch building a plane is commendable. Flying it can be another experience and frustrating if you are trying to learn by yourself. Do yourself a favor, join a local club. if they have a plane they use for training newbies they will put you on a buddy cord and then you will appreciate the importance of belonging to a club and learning to fly properly.
Since you would like to scratch build you may want to start with a kit as your first experience and this can be your trainer. The SIG Kadet is one that comes to mind but there are many others. Once you have this experience behind you, if you still want to scratch build, go to it. The skies the limit when it comes to scratch building.