1) - you should make decison what kind of garments you should do, child, miss etc. I suggest you do panty for younger. go cheaper. and big quantity. If price is right, you can do easy over 300,000pcs annually
2) Panty, does not need design, only couple of patients. You can copy it from market
3) only one hard job for you, choice fabric, which should be. it is very hard, harder or hardest.
4)But careful what store or companies you sell. I think you should put your 60% time to find right store or company, and put 75% time to collect your nice money
5) Use factor.
6) keep good health, make sure excise each day.
7) if you find your customer bankrupt, and next day open another name store, do not surprise. Your only job is claim to Factor.
8) good luck