Choose lens based on the type of photography you will be doing the most.
Landscape, events, portraits, streets, sports & fast motion, indoor and dim lightings, birds and super far away objects, etc.
For basic photography, the kit lens is sufficient.
SAL 55-200 will be good if you need the extra reach, but ask yourself how often will you be using it ?
An external flash will be useful to own for events and indoor shoots.
A tripod if you do night shoot.
So basic items to own:
1) 18-55 kit lens for most occasions and general shooting.
2) 55-200 tele for events and some reach.
3) 50 f1.8 prime if you like to explore the beauty of prime lens
4) External flash for indoor shoot.
5) A good camera bag to house your lens and the camera body.
6) A maintenance kit to clean your lens and body.
7) An electrical dry cabinet to keep your gears when not using. (This is a must buy).
8) A good and stable tripod for night shoot.
In short, yes ur kit lens can take portraits without any problem. However a 50mm f1.8 prime lens will be better for portrait shots.
Currently there's a promotion. Extend your warranty for 2 more years at $230, and get the 50mm prime lens for free. Very worth it imo, especially since u r doing portraits and can put the prime lens to good use.
No need to regret getting the 55-200. Can easily get a 2nd hand one cheap at the BnS section. Rather, you should regret not getting the 50F1.8 that comes free with the sony 2yr warranty. Not only is this prime lens excellent for potraits (I have one) the 2 yr sony warrant also allows you to send your camera in for free sensor cleaning every 3 mths. Also, once you tasted the sharpness of a prime....the kit zoom just won't do...
I recommend another lens which I have - 30F2.8 Macro. The Macro is good for taking food and other closeup like flowers (but not insects). 30mm is wide enough for most purposes including potraits and landscape. F2.8 is fast enough for most normal indoor lighting and brightly lit night scene. In fact, I use this lens most often nowadays.