Welcome sa group bro. Not to sound pushy or nagyayabang, but choosing this as a "hobby" is going to be a handful. Ako nga na may trabaho na and earning decently, I still find collecting reps too much to my expenses kaya unless I really like a particular model or good priced sale items, saka ako bumibili.
Pero if you will say na student ka pa lang, and you are in a limited budget, I hate to say this but I think you'll be better off with Gens that are within your price range. Start with good Seiko pieces or 2nd hand Orients... You won't get a good piece of rep with a 100$ or 5000 pesos price range... Even the quartz reps around $200 na ang prices, so the automatic ones are going to be sold at a higher price, kahit second hand. Shipping pa nga lang, $30 na ang starting rate (That's about 1600 pesos na, wala pang relo).
Lalo na sa situation ngayon na mahigpit ang China, I highly doubt may makukuha ka na matinong rep with the money that you have, kaya I suggest to start with cheap Gen watches that will suit your budget and enjoy them before jumping on the next level of collecting timepieces. If I may ask, what or who influenced you to go with rep watches and why? (parang Miss Universe eh)
Again,don't get me wrong ha, you have all the right to do what you want to do, we are here just to remind you para you won't regret your (first) purchase and enjoy it moving forward.