Hi eyton402,
Catch the train to Phaya Thai station and then a BTS to Nana is fine if you don't have a large bag or suitcases as there are no lifts at Nana.
May is suggest that you get the train to Phaya Thai station then a Taxi to Soi 6, and the fare is about 50 Baht including a tip. Phaya Thai has a lift and is only about 40 metres to a Taxi rank with helpful staff. Ive used it and no problems.
No NOT take the train to Makasan station its full of Thai taxi Mafia.
Cheers
Richard