Advice:
Have a strategy: There's two main ways I think about auction drafts - Stars and Scrubs and Balanced. Stars and Scrubs is spending a ton of money on 3 or so players and then building around them a team of 3-5 dollar players. With this you may spend 180 dollars to get David Johnson, Mike Evans, and A.J. Green but now you have 12 roster spots and 20 dollars to fill them. A dollar for kickers/defends leaves you with 10 spots at 18 dollars for an average of 1.8 dollars per player. These are just whatever numbers thrown out. Balanced is going "Okay, I'll spend 120 on skill positions (WR/RB), 15~ on a QB (This is Matt Ryan territory), and fill out the rest". This leaves you with 65 dollars to grab some talent for your bench so you aren't dependent on a few guys every week.
Know who you're going for and how much you wanna spend: If you're going for, say, Julio Jones and he usually goes for 60 dollars you can say "I'll go as high as 71 on Julio". You may go a bit over but know when to bow out. You're not gonna get every player you want.
Don't always nominate a player you actually want: If it's your turn to nominate and, say, Miller is still at play, who you want on your team, you may want to nominate someone like Isiah Crowell to get an RB spot/money off the table. This is especially effective early on when people have a ton of money and are willing to overspend a bit.
Don't be afraid to spend: You may think you spent a few bucks too much on a player but it's better to overspend by 6 bucks than to leave the draft with 15 dollars left over that could've went to upgrading a position.
Read the room: Some people value WRs over RB, some will wait forever on QB, some will scramble and overspend on top QBs, what have you. Look at the teams they have so far, it may be a player and you with 90 bucks left over that's the most in the league ATM but they've got 4 RBs on their team so you throw out an RB you want and they're less likely to bid.
DO NOT BID ON A PLAYER UNLESS YOU ACTUALLY WANT THEM!!!!: This gets people all the time. Somebody is being drafted way below the dollar amount you think they should, let's say Gordon is going for 35 when usually he goes for 50, you may want to bid to drive up the cost on the owner that wants him and to get a few more bucks out of them. You don't really want Gordon, you don't believe in him or whatever, but you don't want him to go that low. Well the bid is now 42 and you're in the lead and the other owner stops bidding. You're now stuck with a player you didn't want just because you wanted to drive up the price a bit.