I agree with most every tip people said here.
I started collecting video games way before it became popular, Most people looked at me like I was nuts back then.
But I didn't care, I enjoyed it, and that's what I would tell a new collector. Do it because you enjoy it, Hunting for those good or rare games at cheap prices. Don't start just because you hear other people are doing it or you watched some guy on you tube.
And if you want to start, then do some foot work and look for the games & consoles you loved, start small and don't go crazy on ebay and click "buy it now". The stuff I get off ebay is when I see a good fair price, I make offers and get lucky sometimes.
Don't get caught up in a bidding war. I've seen items go for WAY over the price of the same item that someone has a Buy It Now for.
I have over 8000 video games & hardware because I have had a passion for it for over 25 years, I always knew my limit and passed down many items because I didn't want to pay the price the seller was asking at the time. (I few I could kick myself for now) but that's the fun in the hunt.
Don't think just because you have a collection of 50 games that the rest of the collectors will think less of you, if fact we don't care if you have 10 or 10,000 items, so take your time and it helps finding other people in you area who share your passion and help each other out. When I go out hunting I look for my friends who collect too, and most of them tell me about stuff they think I might be interested in. Hell we even get together on hunts (these are a ton of fun)
If you want to be a collector then collect what makes you happy, whether it be Action Figures, Barbie Dolls, Beenie Babies, Movies, Salt & Pepper Shakers, Pez Dispensers and of course Video Games. I even love to talk to collectors who collect other items and love to see their collections.
If your getting into collecting because "i'm going to make money off of it" then your in the wrong mind set. If I found an expensive game for cheap, If I don't have it I keep it, If I already own it, I use it to trade for something I need.
And it's always fun to brag about a great deal you got.
I'm not in it for the money, I'm in it because I enjoy it.
And I enjoy other people who share my passion. If you enjoy gaming/collecting and the hunt of finding games you want to play or finding a good deal on that rare piece and add it to your collection then your welcome to the club.
Just don't do it just because it's the "in" thing to collect.
If video game collecting crashed tomorrow and everyone was bailing to sell their collection I would still be looking for games I want in my collection and buy those pieces out of other peoples collections for cheap. I collected before it was popular and I would continue after it crashes.
Nuff said.