...so what would an ancient human ranking system be like? Any ideas?
Do you have a language/vocabulary or glossary of words they currently use?
Also the other question is, how would I go about creating a language that doesn't sound like gibberish but an actual real life language?
Whoops, guess not. Okay, for reasons I'll not discuss here I have some experience with this. To date regarding writing I have developed a few-thousand word Barbarian language (along with a considerable amount of supporting cultural elements, religion, alphabet (which can be found here) etc.), and have begun building a 'pidgin' language for a dystopian near-future, have worked with WWII Japanese Army Air Corps terms (along with picking at learning Japanese), etc. and so on.
Assuming that you have essentially done nothing for your story in this regard, I would make the following suggestion. Begin by coming up with a few simple basic words. Yes, no, and (in addition), less, more, etc.. Keep them brief/short in that they're meat to be a quick and exact response or a modifier. The easiest way then to build a vocabulary is to take lines of your characters and begin generating words for each within that line. Remember, some words will build upon an existing word, or be a mix of two words.
An example from that Barbarian language where it is built upon:
Universal word modifiers used throughout the language are:
Sot: light, minimum, good, pale/bright, cold, slave, none, weak, slow, etc.
Mon: medium, average, balanced, shaded, temperate, average ranking person, few/some, average, etc.
Fed: heavy, maximum, evil, dark, hot, warrior, many, strong, heavy exertion, fast, etc.
Yes and No are as follows:
Ghey: Yes (ghey'sot = possibly, ghey'mon = probably, ghey'fed = definitely)
Tdok: No (tdok'sot = doubtful, tdok'mon = probably not, tdok'fed = absolutely not, refusal)
In contrast you could have a blending of two words to convey a shade or variance.
Toup: Yes
Sous: No
Tous: Maybe
In any case, begin building the language simply using existing phrases you have and then see how it flows. My barbarian language was supposed to sound guttural (also know I wrote it 15-years ago so would not have it read the same now).
So here is an example wherein it is in English, Hamr and finally as written (note that it has an excessive amount of modifiers (sot, mon, fed) in that it is written, not spoken to be precise... gesture when spoken used to convey that aspect):
Emperor Stormbringer of the Outlands;
It is fact, you are not Moragan Hammer. Not even Barbarian that the Hammer know, yet you have passed a mark of time since the Hammer learned of you. 9 years and the Hammer has watched, listened and waited.
The faithful Hammer know all things in life come in threes, and three times three equalling nine the greatest of all.
The Hammer make you this bound agreement. The Hammer will never serve you, never fight with you as the Hammer are free. Yet the Hammer will not threaten you, attack you, or make war with you, and respect and celebrate you and your empire, nine good years and desire you have onethousand more.
All of the Clan of Moragan Hammer
Tem'Moragan'fed Stae'fed'tarv'koft'sot'groth tem da Dachvst_
Verta'sot, du da tdok Moragan Hamr_ Tdok vet'sot Tem'Kref tem da Hamr sastva, pes du dek koft'fed'd'vute tem de vut sosh'lums dek da Hamr tarv'sastva tem du_ 9 kot'feds un da Hamr dek ba'dek, be'dek un kif'dek_
Da kocve' Hamr sastva di'fed de vut'fed sosh koft'sot vut'fed di'ko, un unnum ko di'ko da to da fed tem di'fed_
Da Hamr taub du de'tem pax'fed_ Da Hamr daf tdok'fed tarvma du, tdok'fed targda'mon tarvma du da Hamr tem saufa'mon_ Pes da Hamr daf tdok targwa du, targza du, pes taub targda'fed vut'mon du un zanfa un trupda du un do Tem'Moragan'fed'Kochtraam, to doj kot'feds un quostva'mon du do ka'un'feds un_
Di'fed tem da Tem'Kref'mon
K2
Oh! As a BIG P.S.:
You need to right off determine what the culture of your race is like. Are they a warrior race, technological, agricultural or whatever. You need to keep that in mind when building the language to keep those aspects which strengthen their beliefs and are important to them strong, those they think less of somewhat weak, and those they are against either commonly insulting or degrading.