Right, thanks for your reply so promptly.
I hope you will not think that I am 'laying down the law' here - all these thoghts are mine and mine alone, but I think I have some idea of what I am doing and saying about photography so please bear with me.
I presume you are thinking about a 10D?
OK, then you have no lenses to go on this so you are starting with a clean sheet.
1/ Try to afford to buy the best lenses you can even if you think they are not wide or telephoto enough for you at the time, always aim for Canon if possible.
2/ Start off slowly and learn to use the camera with just one lens - try the 50.1.8 Canon (cheap and excellent optically), or a 28-135 IS, for a more flexible lens.
3/ Put thoughts about the bird photography away until you can afford something much, much longer than the normal run of lenses. Pro bird photographers use 500 or 600/4L lenses with extenders on them. The Canon 400/5.6 gets good reports and is lots cheaper and more portable, a Sigma 400/5.6 is a possibility.
4/ A word of caution - long zooms are never as good as prime telephoto lenses, forget cheap wide range 'superzooms' whatever the salesman might say.
Sigma supposedly do some good long zooms although I've not used these myself - the 135-400mm and 50-500mm but the prices still aren't cheap.
5/ Always try to use the lenses you are thinking of buying on your body and look at the images on the computer before deciding. If possible get the shop (if they are a good photo store they will do this) to let you try the lens and put it on one side until you let them know if you want it - this way you get the lens you have tested and know that it works OK and is up to standard.
Don't forget that the 10D gives you that 1.6 multiplier so a 400mm is effectively = 640mm on a film camera so you will need a good monopod at least when walking and a decent tripod if you are in one place for any length of time.
All the best and enjoy learning and owning some decent gear to take photos with - that's what it's all about.