Alright, the concept of "offer" doesn't really exist they usually specify what they want or the price for said item. You can either type out the price and a simple よろしくお願いします (yoroshiku onegaishimasu) in the comment, or use the comment to write in what item/price you want. You can still add a 日本語はわかりません (i dont understand japanese) i guess, but if you learn these you shouldn't have problems. Here are some examples:
You'll have to remember some of these basic kanjis
Price:
-万 (man) = 0 000 (1万 is 10k, 10万 is 100k..)
-億 (oku) = 000 000 (1億 is 100mil, 10億 is 1bil..)
Trades:
- xxx と交換します (to koukan shimasu) = will exchange for xxx
- xxx or yyy と交換します = same as above but will exchange for xxx or yyy
Mixed trades (this is for when you want item + macca):
- xxx + 1億 と交換 = will exchange for xxx + 100mil
Replying to a TL insertion can go like this:
- 売ります (urimasu) = (i'm selling this)
- 買います (kaimasu) = (i'm buying this)
Specify how many of said item you have/want:
-1個あります (1ko arimasu) = I have one (ko = piece)
-1個でお願いします (1ko de onegaishimasu) = One, please
Next comes the meeting and actual trading, it's going to get a bit difficult but i'll put it as simply as I can
Places for meeting:
バベルの邪教 (baberu no jakyou) = (at Babel's Cathedral)
エレベーターガール (erebe-ta- ga-ru) = (in front of elevator girl/alto vision)
It's courtesy to use the greeting emote and say よろしくお願いします before trading
When done, ありがとうございました, またよろしくお願いします 9arigatou gozaimashita, mata yoroshiku onegaishimasu) and use the bow/thanks emote
Upon leaving, それでは (soredeha) and use farewell/goodbye emote
There will be times where people will try offering items that you did not specify, in case you are not interested in items you can say すみません、マッカだけを受けいます (sumimasen, makka dake wo ukeimasu = sorry i accept only macca) or simply refuse by ignoring/deleting or saying すみません、断ります.(sumimasen, kotowarimasu = sorry i refuse)
This should be all~ (i hope) depending on how good u are at learning u will get used to it at ur own pace so don't worry much `3`