This is what I did when in your situation a few months back. I bought a 500D twin lens kit. 18-55 and 55-250. These are good enough lenses for a beginner. I also bought a good tripod for Landscapes, which you can also use for your Portrait work.
Then you go out and take photos when ever you can. You will see each time you go out your photos will get better. If down the track you find that these lenses are no longer keeping up with your abilities then you can upgrade.
Its easy to get caught up in all the hype of which lens is better for which situation, but at the end of the day you will still be taking some good photos with your kit lens while you improve your technique and decide on your direction. My direction changes weekly as I discover new subjects to photograph.