I am free-to-play. Don't think get Recruit and Tionese free.
Should I buy recruit gear with credits?
Where can I buy the Implants with credits? GTN?
Which other slot can buy with credits?
I think F2P/Preferred player do get some Tionese gear for free (or some Tionese Commendations to buy it in one quest) but even if we do or even if you buy this gear with credits, we still won't be able to wear it. F2P/Preferred players don't have Artifact Equipment Authorization, we can't wear any purple gear. Unfortunately, Artifact Equipment Authorization is one of the most expensive Cartel Market unlocks...
You get it for 30 or 35 bh comms; people paying credits I'm guessing are rich guys quickly equipping alts. The price is "normal" but they don't seem to sell too quickly and get relisted often, while rakata stuff for less than 130 or 140k moves almost immediately.