-Beginner a77 - and suggestions about tamron PS 70-300 USD Di

either get an all in one eg 18-250 or add the 18-135 or 16-105, depending on your shooting needs.

You might also want to get the 35mm 1.8 for low light shots...

I have the 18-200 and quite happy with it, especially now that it was added in the firmware... Use it for travelling or excursions and usually prefer not to change lenses then...