Commercial Fixed Wing
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Distraction; Confusion; Situational Awareness
ATC Issue All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance; Ground Event / Encounter Other / Unknown; Ground Incursion Taxiway
Air Traffic Control Issued New Clearance; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Became Reoriented
Airport
After pushing from gate we were handed from Ramp to Ground ATC. We reported at the box '2 west north line'.  Ground gave us a change of runway from 34 Left to 16 Right and taxi via Bravo which was now a right turn instead of the expected left.  On the taxi chart it is unclear that there is an F4 taxiway on the ramp prior to reaching Bravo when exiting the ramp. We followed the first right turn which was not taxiway Bravo. It was Foxtrot 4. We looked around and saw no signs for a Bravo taxiway; only Alpha. We spoke with Ground Control; who also was unfamiliar and checked with Ramp. We then proceeded north on F4; Echo; Bravo as recleared by Ground. Taxi lines are not painted with turn off letters indicating what line they are. No signage for Bravo anywhere to be found.
An Air carrier pilot reported a lack of taxiway signage and markings caused taxiing confusion.