See How to Build: All Weapons for information on what actives/passives are recommended for each weapon, both when used as primary weapon and as secondary.
Since there is very lttle synergy between weapons in SWL (unlike TSW), your exact weapon combination does not matter all that much. Just decide which weapon will be your primary and which will be your secondary.
(As an aside, while blade/pistol was a perfectly viable combination in TSW the pre-built Paladin deck wasn’t very good. None of the pre-built decks in TSW was very good actually.)