I agree with Spena.
I've been out of the game for over 2 years now and I decided about 3 days ago to start playing again. All the time I've spent so far has been deciding on what type of deck is best for the result that I'm trying to achieve. I want to be able to stand up against whatever is meta (meta means whatever the hell is used by most people nowadays) and it needs to be fast and powerful.
So I did some googling (google is your bff here) and my eye landed on beatdowns. I'd made a vanilla beatdown before, so I figured it would be fun to play with.
I ended up choosing an anti-meta skilldrain beatdown which basically means I get a lot of powerful monsters that are easy to summon but have bad or semi-bad effects when you do get them on the field easily, and then you negate their effects (turning them into powerhouses) by using skill drain.
Basically, what you'll want to do is dig and find a nice theme that suits you, then check out what kind of decks people have constructed around this theme, get a feel for what they're trying to accomplish with the cards, and then edit it or create your own from scratch.
I find it easy to use YVD (google it..) to browse through the giant list of cards. It also has a search function and a built-in banlist so you won't have to worry about accidentally adding too many copies of a card.
Hope this helps you get started.