Master Bountyhunter at the moment thought i'd share my idea's on it.
First of all BH has very bad defence so don't do i with out a second proffesion like pistols or TK so u have a fighting change if the start getting melee on u .
Pistols carbine and LCC i have not much to say about that xp is easy enough just take aim and fire :).
Investigation is the hard part.
Here is how i did it.
Novice BH go to corronets BH terminal and take a mission keep the terminal open.
Talk to the informent standing next to it he'll give u the wp of the target if its not in corro or a other place u can get to by one shuttle(or your own ship).drop the mission again and take an other mission. Keep doing this until u have enough XP to learn INV 1&2 at the same time.
Why u ask should u learn 1&2 at the same time, simple if u learn INV 1 u'll get send of world for the same bad xp and would have to sure droids witch will most likely fail more then work at this lvl.
INV3
First things first go to your local DE and get some Arakyd and seeker droids buy enough u'll use them alot.
Once u get inv 2 Naboo is the place to be Kadaara to be more exact the terminal is a bit far but the informent is right next to the starport. the informent now doesn't give u a wp but a bio signiture of the target, witch u need to upload into your droid. sounds hard well its not if u know how.
Once u talk to the informent go at least 400m out of the city and launch your arakyd droid.If u can't launch move further away (find a spot as close as possilbe and wp it saves time) if u do launch your droid will come crashing down after 20 sec. look for the explosion or the white spot on your map since sometimes it move kinda far form u, now use the radial menu to upload the bio-signal to the droid. now it will shoot into space again looking for your target.
Time for u to swoop back to the starport once u arrive thare u should be getting your msg Target found on "planet name" soon. well u guessed it fly to that planet ( JTL helps to keep the cost low since u can use your own ship to move around)once on the planet u'll see the wp of the target well if u go there u will be looking at nothing since it isn't going to wait for u to kill it. Here seekers come into use launch a seeker useing the track target command of the radial menu, it will take some time to give u the new wp so move as close to the old one as possible since it won't have gotten far on foot. (u'll be there sometimes before the seeker give u the new info and will have to go back) move to the new wp once u get it but before u move launch a other seeker it will take 3 seekers most of the time to find the target.
Keep doing this until u get INV3 and we move on to getting INV4 (who said BH inv was boring)
once u get inv3 u can get jedi mission at the BH terminal as i'm not one to hunt jedi's i'm skipping any info on this.
INV4
INV 4 is actualy easyer to get as 3 since with 3 u'll get the track command on the droid wich will keep u updated on the target position.
Same story as 3 only use the terminal and informant at Keren Naboo there rather close toghter so that saves time again.
Again launch the arakyd and find the planet but now when u are on planet use the find and track command on the droid it will keep following the target not and keep u'r wp updated.(it will lose the target from time to time but it will not require as much droids as inv3.)
Keep doing so until u have inv4.
Well thats how i did it added a list of the terminals and informents i used .
Greetings Alas.
PS as i wrote this i began doubting if i switched keren and kadaara around will let u know once i confirm this.
alas can you explain it ones more pls 
to much info 
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