this is link what i try

I try to use this model make but if follow this video or then mod it keeps crash so I don't know how I can make a mod like I mean on this video 

https://www.youtube.com/watch?v=jM-KFeE22Yo&list=PL5-YaiqtfIXaA_1cQhgJ19JpViDWCpuRs&index=7  

also, I try to make the models better and also cash by me or even does pick up the files of the model like i try everything good and still get it not right how can every try better to understand about the only thing I can make is biome and other worlds or even tools and armor and not that I can make is items even make lot type of block that not good name it also on this video on kinda videos I can understand what it means in tutorial however there other and i can not understand complete so hard to follow or that screen is hard to see it want i wearing glasses and i have on my left eye 80% and on my right eye 60%  but still not see good also my reading of spell inline text is not all good so how can i learn something new if keep making same way