Hi Ramana and welcome
Your 2 eyepieces (not lenses) will probably be good enough for some time, at the very least a few months. Deciding on eyepieces is a big topic, as I've recently found out (do a thread search for 'choose eyepiece' or similar). Most experienced people, which I'm not, say that you only need a few eyepieces (low, medium and high power) and perhaps a good Barlow. There are many good articles on the subject in these forums and elsewhere.
Good luck
PS: Regarding your adapter.. there are mainly two sizes of eyepieces, 1.25inch and 2inch. Just stick with 1.25inch for now. 2" eyepieces will give wider views (larger field of view, or FOV).