Welcome to the forum Daniel! Glad to have you onboard!
What about Santa? Santa brought me a Tyco Spirit of 76 RTR (ready to run) set for Christmas in 1974. Any Chance you could put a train set on your list for Santa?
Tyco was the cheapest set available but I loved it and it is what led me to enjoy trains so much now. I would have loved it even more if it came with the new sectional track with road bed. Such Bachmann's EZ track, but that was not available in the 70s.
The RTR sets with track like that are the place to begin if you want my opinion. Keep it simple to start with, learn the basics first. Save your extra money, add to and upgrade your railroad empire as you can, just like the real railroads did!
Amazon has a great starter set
http://www.amazon.com/Bachmann-Trains-Digital-Commander-Ready/dp/B000BPPNWE under $210 with 2 DCC locomotives, rolling stock, track and a basic DCC command controller!!! I think that is the perfect entry into the hobby!
Here is another link to my local hobby shop and one of the cheapest on the internet for more HO sets.
http://www.modeltrainstuff.com/HO-S...htm?searching=Y&sort=1&cat=334&show=60&page=1 Many under $100
I have to give you a link to some Lionel sets!
http://www.modeltrainstuff.com/O-Ga...=Y&sort=1&cat=333&brand=Lionel&show=30&page=1
I personally prefer Lionel O gauge myself now, but it can stretch your budget. HO is the most economical of all scales and has the most products available. N is growing fast and great when space is limited.
Don't let limited space stop you from enjoying what ever size train you want to run. As RedRyder77 points out, you can be creative in how you enjoy your railroad. Many people have RTR sets they set up on the floor and put away when they are finished. There is no prefect way or right or wrong way, just have fun with your trains!
Many will say "go big or go home", "do it right or don't do it" and many other things like that, but I disagree any set you start with will be fine, just get started!
Rodney brought up a great point about used equipment, it most certainly can be problematic! I would recommend you stay away from used equipment to begin with. When you have more experience and can make repairs then eBay and other sources for used equipment will be fine.
One of your best resources can be your local library. As other have mentioned reading about the hobby is a great way to enhance your enjoyment of the hobby.
Don't let anyone tell you how or what to run with your railroad. You are the CEO and you make all the decisions, we are your advisors, nothing more.
As CJ one of our most esteemed forum members and future hall of fame model railroader (in my mind) is fond of saying "the only stupid question is the one you don't ask"
I am very happy to see a "kid wants to get started in model railroading"
Don't be a stranger, you made my day with this thread!
You ROCK young man!