Acer Saccharum's advice is spot on. If you have not built a kit before you need to start a little personal library. A few "how to build a longrifle" books are necessary. In addition find some books that have original examples of the type rifle you want to build.
I'm not an expert in building, but I am an expert at getting started.
I've completed 2 kits. The first one I was expecting "model airplane" instructions. When it arrived with NO INSTRUCTIONS I didn't know where to start. It was five years before I got advice from a member here to 1) sign up here and 2) buy a few recommended books. That got me started. The second kit was a Chambers, the parts required less work and it came with limited instructions, they expect that you know what you are doing. It took a few months but I still needed to refer to my "library".
The best thing is this site with so many experienced builders who are willing to help new builders. When you get stuck you have backup.
Enjoy your journey!