Ahoy mate :
Your question is a bit too basic to get the answers you probably expect.
I suggest you look at the manufacturers installation/application notes for ideas on how you might proceed for your installation
Series or parallel connection of the solar panels
affords you either increasing the voltage (series) output or the current
(parallel) output, depends on what you want/need. Series connections are used to get higher voltages to work
with a charging
circuit (regulator etc) that controls the charge (current & voltage) rate for your battery
system state needs. Series connection is used to get higher charging current
capability. You will need extra voltage to make up for the voltage drop across the regulator/charger circuit that will occur if used. You also need blocking diodes (high current, low voltage drop) to avoid battery
discharge (current reversal flow) through the panels
when there is not enough sun to balance the back EMF of the batteries
. Here are some links to other areas that may help :
Solar charger for lead-acid batteries
A solar battery charger
Installing a Solar Panel to Maintain Batteries
by Don Casey
Installing a solar panel system with PWM charge controller on your boat
and keep your deep cycle batteries charged at all times.
by Adrian Biffen
Website-Main - Solar panel with PWM charge controller for sailboat
.com is your search friend, seek and ye shall find.
Hope this helps.
-- Best of luck & Have a g'day mate ;-)