The right size for me...

Hello everyone
Looking for some advice buying my first longboard, hope to get it here.
Sorry if my English is half good... But ill try hard
Im a 38 y female intermediate surfer. Im 5ft and slim so i usually surf a 5.6 shortboard, a 5.4 FireWire nano or a 6.8 funboard, depanding how big waves are.
Im looking for a full-time summer surfboards and also maybe try walking the board. Not looking to.manuver the board as much trying new style bof surfing couse i get that from my other board.
Ive found a second hand 9.5 Stewart tipster in really good shape and price. Is that gonna be a good size to start from? Dose it metter if its a 9 or a 9.5?
Ive been reading online, maybe too much, and got confused. Please help me...
Looking for some advice buying my first longboard, hope to get it here.
Sorry if my English is half good... But ill try hard

Im a 38 y female intermediate surfer. Im 5ft and slim so i usually surf a 5.6 shortboard, a 5.4 FireWire nano or a 6.8 funboard, depanding how big waves are.
Im looking for a full-time summer surfboards and also maybe try walking the board. Not looking to.manuver the board as much trying new style bof surfing couse i get that from my other board.
Ive found a second hand 9.5 Stewart tipster in really good shape and price. Is that gonna be a good size to start from? Dose it metter if its a 9 or a 9.5?
Ive been reading online, maybe too much, and got confused. Please help me...