I have a 14-foot boat with a 25hp evinrude electric start 2 stroke motor with forward throttle and steering.  It also has a 67-pound thrust trolling motor, a small live well, and a fish finder.  How many batteries do I need and how do you suggest I wire them, meaning what components should I wire to each battery?  I suppose I will need to get a charger.  I don't even know if a two stroke motor (older model) has an alternator.  This is my first powered boat and I need some advice.

If it's a late 60's - early 70's (has the little bullet shape foot and does not have through the prop exhaust) 25 Evinrude, most likely it does not have a charging system.   The good part is the motor is easily pull started if in good running order so if you do only run one battery and run it down, you can still crank the motor to get back to the ramp.  It does not need a battery to run, just make sure you keep a pull rope with you, normally there's a pouch inside the cover for one.   There is also a manual choke to choke the motor if needed, might want to check out the pull start just to make sure you want to use that as a backup, make sure it does pull start easily.  I would use the electric start first, let it run some then try it, they can sometimes be a pain to cold start with a pull rope but after they've been run one time that day, the crank pretty easily.

Even the later models with through the prop exhaust and a charging system can still be pull started easily.  Evinrudes and Johnson's do not need a battery to crank and run.  

Now, that 67 pound thrust TM, is that a 12V only  motor or a 12/24, most that size I've seen are 12/24 so you will need two batteries for it.  Trying to run a 12/24 on just 12 is only going to give you about 10 pounds of thrust on the highest setting.  If it is 12/24 you're going to need to run a series/parallel hookup to the front of the boat to be able to use both 12/24 functions on the motor.