So I have some experience programming in Java, and at the moment I am learning how to use Python. I have read on the process of game design and such. I also have media covered, got experience with graphics and audio. My question is geared more towards the actual tools to use for making games, developing. I am willing to commit to a long term development cycle, as I will be doing this as a hobby. I've heard of Flash, Gamemaker, etc. I don't intend to create my own Game Engine, so I was looking for a platform that is extensible and easy to program with an OOP mind frame. As a plus it would be great of said game could be played directly from a website. TIA!
If you want to go lower-level and take advantage of your Java skills, you could check out JMonkeyEngine. This is a Java graphics engine with some extra features that make it particularly tuned to games. It is scene-graph based, which means instead of worrying about drawing polygons on screen (or pushing them to the graphics card), you simply load meshes and manipulate the meshes in a tree structure, e.g. everything in the scene is a node in the scene graph, so child nodes inherit from their parents and so on. This might be the object-oriented aspect you're looking for.
These are my recommendations to you. If you want a drag-and-drop style interface and just want to do high-level scripting, go with Unity. If you want to write your game essentially from scratch, but not too low-level, go with JMonkeyEngine.
For any further information I suggest you search our site. Almost every day we get a question like this, asking how to start game development, so there are many search results. Please notice the search box in the top right corner.
Even if you're an experienced programmer (any level of experience), I might recommend using something like GameMaker to build a simple game, before you start building your own. Start with building a game whose rules are well defined, and on the more simple side, think TicTacToe, Pong, or something similar. This will help get you orentated to the process your going to need without getting you stuck in the actual development. This can help you get your art and asset creation workflow down pat. (For my own experience, it this has been my largest pitfall, I spent too much time programming the game and got disenchanted with the project because I hadn't formalized an art workflow for myself.)
If you are not set on building your own engine (which is a good thing, get a game out there thats fun, even the best engine wont make a fun game) AND you are willing to be language agnostic (even though you have Java, you mention GameMaker and Flash) and have thoughts of possibly going public with your game, Epic recently upped the total amount you need to make (from 5k to 50k) before the royalties kick in for using the UDK. Its big and complicated, but it has a good deal of head-room.
As Ricket said, Unity is hot right now, and has a pretty low bar to entry and might be worth looking in to.
If being cross-platform is not of high value to you and you would rather do some programming, I cannot recommend C# and XNA highly enough. C# has all of the good parts of Java, without all of the poor parts, like the Java implementation of Genrics, and all the goodness of DirectX in a very "managed" style API. TorqueX is an XNA engine, but if you see my question here: it is not highly recommended. There are other XNA based frameworks and engines that can help get you off the ground; depending on the complexity of your game, you may not need any of these engines.
If you are dedicated to Python, you might want to look into pygame -- I'm not much of a python guy, so I can't commont on its ease of use, but I've heard it mentioned a lot with respect to game development in Python.
I'm surprised no one suggested http://PyGame.org since you already now Python.
Flash/Unity will get your game on the web, though those are proprietary technologies and I would not recommend it for hobby game development - not a lot of hobbyists have the resources to learn non-free tools.
If you are adventurous you might want to try any of the new html5 game engines (those will become feasible to deploy in the coming years): https://github.com/bebraw/jswiki/wiki/Game-Engines