Train cows in Lumby till 25-30 Range,
than go to Rock crabs.

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Or you can check this out.

Quick summary and good quests to do to gain a few advantages:
Quests(f2p and p2p)
If keeping 1 defence make sure to check all the relevant rewards from quests incase of unwanted xP)
fremnik trials
fremnik isles
waterfall quest
temple of ikov
biohazard,
underground pass
roving elves
regicide
heroes(so you get a good idea of where all of taverly dungeons stuff is)
smoking kills(full slayer helm for slayer task training for bonus damage/accuracy threshold)
Horror from the deep(unholybook, armadyl book or ancient book seem to be best, unholy has the best attack bonus!)



1~10 id say cows or anything around lumbridge or of a combat similar to you, i would sa the cow field near the windmill in lumbridge is best as beefy bill will transport hides to the bank for you meaning abit of GP made.

11~20 you can either carry on with the above at a greater speed and more profit. if not after the bit of extra cash id go for monks now located just north west of the barbarian village , they drop bones and very rarely monk robes but offer the ability to heal you if you talk to them (heals 10 hp at a time)

21~30 either stay at monks or id go to the strong hold of security and try and rush through that for a free 10k and some nice boots on the first level there is a lovely safe spot for minotaurs and wolves, take your pick on what to kill and pick up any noted items /fod stuffs to prolong time there

31~40 i personally did minotaurs still, but you can trian on barbarians in the long hall, skeletons , anything around level 20~30ish id say to keep a good hp/xp ratio to killing speed

40~50 if f2p basically keep repeating the same stuff if on p2p either the ranging game at the ranging guild or rock crabs or stuff at ardougne zoo.

50~70 do biohazard and range ogres that are in teh cage from the training camp, if 32 magic(think its 32 not sure) take telegrab and grab the seeds they drop good time to switch to a crossbow and the unholy book

70~99 anything you feel really, i did smoking kills around this point and ranged every slayer task i could until about 82 ranged and then did ogres again until 99, from 82~99 it took me lesss than 2 weeks doing about 4 hours thier a night and made me around 20mil+ due to seed prices and ammunition etc (bone crossbow and bolts were the most GP friendly being the strength of iron yet only 4gp a bolt back then)

other options could include pest control as suggested from 40 onwards but you need a combat level of 40 to do pest control!

i tend to find slayer the best option personally from 50 or 60 onwards if you have good ranged bonus or the slayer helm and decent ammunition as you get a nice damage bonus, access to broad bolts (strengt of addamant except a fraction of the price) and it gives XP in slayer and gives soem nice drops and relatively easy clue scrolls aswell which can bring in some extra GP

hope this helps and if you need anymore help feel free to PM me on here.

all my experience with this comes from me and friends (me and all my irl friends have 99ranged , about 30 of my friends play) and we all help with stuff and give various options as we can to help others .
also to add on top more experience is from having 2 accounts at 99 ranged, one on 34million XP another on 17million XP.