If I were you I wouldn't take it at all unless you start having some symptoms of gyno. If this is your first cycle then you probably don't know how you will react to gear yet. It could be that you don't have any problems with aromitazation. If you had problems with gyno during puberty then you probably will need the nolva, but if you didn't, just wait and see how you do without it.
As far as the dosage, how many milligrams are your tabs? Even people who do have problems with gyno usually do fine on one 10mg tab a day. If you are using the Chinaman's 50mg tabs, just cut them in half and take half a tab a day. But again, it may not be necessary to use it at all during your cycle. You may be able to save it and use it for your post cycle recovery.