It's pretty difficult to get relevant articles on the internet as people who teach how to build these things are rarer than the ones which teach you how to listen to them
- fortunately this forum exists 
Nobody can truly teach this stuff WC. Once you choose to build a transmitter rather than to buy something pre-made, you begin a learning journey. Even if one is well-versed in electrical theory, RF circuits bring a whole new dimension to the fore. You enter a realm where component leads act like antennas, where poor solder joints and cladded circuit boards exhibit capacitance, and where even the orientation of many components will determine whether your circuit works properly or not. That's why we chose the name "Black Arts". Like your Doctor who progressively gains his expertise by practicing the medical arts, transmitter builders must practice their craft in order to become successful at building progressively more ambitious projects.
If you are trained in electrical engineering then I would say you are ready to start the journey. If not, then you need to start small, and take baby steps toward your goal. Like it or not, there is no other way. You will never learn what you need to learn by bouncing posts back and forth on this or any forum. We exist to share experience and provide support for fellow builders. Nobody here can solve another's problems because nobody here can ever be present at another's workbench. If you should decide that you would like to start the journey, we're happy to provide support if we can. One site that I often recommend for newbs is makerf.com which covers the very basics and does it in a fun and interesting way. He has some starter circuits - including a small shortwave transmitter. Then with some electronics study on the side you might be ready for Radio Anarchy's Guerilla. Start small and build on your successes. Step by step, one foot in front of the other. That's how the journey is made.
If you decide this is not for you, I understand. In that case I would recommend you purchase your rig. It is much easier, and you'll save a lot of frustration. As to your Antenna question - a resonant antenna is all you need - dipole, inverted vee or similar. You will need some real planning to fit one of them into a city environment. Getting into more arcane designs such as loops require a lot of complicated impedance matching and tuning. However you decide to proceed WC, good luck with your project...