that 10-20mm is a good lens but don't expect too much from the 70-300
very soft over 200mm although if its the APO version with the red ring around the end of the lens it will be better. but not much!
sounds like you've got a good deal lined up
the main thing to remember at first is you will have much more control over your photography which directly translates into - much more chance of messing it up!
a lot of people buy a DSLR & at first their pics are worse than they were getting with their point & shoot & they end up not using the DSLR
best advice is stick with it & keep asking questions if you need to. there should be plenty of people who can help/advise you
this might be a good idea for you to try once you've had a dabble
http://www.johnthawley.com/journal/2...cameraman.html
also the author of that article John Thawley is a regular poster in the photography section on the Starting Grid forum
maybe join in on the back to basics thread or any of the monthly comps
http://www.sgrid.com/forum/showthrea...-to-the-Basics