Yes to your main question. you will have a lot to learn (Like all of us at one time. we all started with no knowledge of any thing.)
the videos are a good start if you have some money you may want to try some of his. I have them and there very good learned a lot from them.
ask question. a lot of good people here.
also find a good 3d modeling program (blender, Maya Maya LT. Modo so on)
Blender is free. Maya is very expensive (At Lest for me.) Maya Lt $30 a mouth or 240 if you pay by the year. Not sure what Modo is. A lot of people here seem to like it. not sure how well it works with unreal?
They all have free trails try them all. see which work you like, which one you like the work flow best or pick up the fastest.
I use Maya Lt and Blender. I use Maya Lt about 90% of the time. If you are really into to it and have the money Maya would be the best. (if this is not just for fun. you plan to make money.)
Edit: get some simple sample project Look at them and study them see how they where put together. then try to redo it yourself.
keep doing this over and over. get harder ones as you go. (to me best way to learn)
Never give up on your Dream.