Hi, and welcome to the board. I think your first thoughts need to be how big do you want the model to be and if you have a particular interest such as warships, liners, fishing, speed boats etc.
Once decided I think its important to make something relatively simple to get you into the hobby. The main thing is enjoyment, for example I would counsel you perhaps not start with Titanic at 6 feet long as you may never finish it.
We are making models so in our world nothing is too critical in terms of engine size, prop size and the like and members on the board can easily provide guidance and counsel if you get stuck. We have all been there and got the t-shirt!
Cheers
Geoff