Just want to check if you've considered the Power supply cost in your start up calculation?
Then seeing as it sounds like you are in a smaller space to mine, have you also thought about the noise mostly, and the heat secondly (not sure of your climate)?
Other than that maybe check out this
topic about getting startedAfter going through that if there are no other issues my only advice is don't wait. Find a machine at the right price and go for it, because if you only have a certain amount of time with this setup your profits decrease each day you wait. You can check out the
marketplace here but read these topics before making a deal with anyone.
About EscrowThis one pertains to sellers but lets you know what to look forHere is a coin profitability calculator site you can use to compare things.
https://www.coinwarz.com/cryptocurrencyMaybe some others can share their (pool) experiences here aswell for newcomers.
To get a decent understanding of pools, you can always check their threads here on the forum (check the
pools board). Generally you can go there ask questions to get a decent vibe of who mines there and why.