First of all, decent camera choice.
On the subject of tripods:
ThreeLeggedThing would be my suggestion although they are quite pricey...
Mine has been seriously used and abused over the last few years and, the only damage I can report is a missing bit of rubber which is nothing, it's also light weight (carbon fibre and all that) and can be dissembled into a monopod.
Had a couple or off brand tripods before had which all broke within a few moments.
In short, if you're thinking long term, get something decent and sturdy.
On the question of lenses:
If you've got the camera in a kit, use that for the time being and get used to just using the camera. Kit lenses are also cheap on the second hand market so you don't need to worry too much about damaging it. The only downside is taking wide angle images.
The keen favourite for UE stuff, especially starting out, is the Sigma 10-10-20mm which will work wonders is tight areas or buildings (think operating theatres, offices and stuff like that).
In the meantime, get some practice, and mess around with the numerous modes ect (especially manual).