Nice effort bro, I've seen way worse teams than that for first time round.
So, the aim of the game is to increase your overall value of your team WHILST scoring as many points as you can at the same time. Easy aye

The three main type of players you're looking at:
Keepers/Gun
You need to start with a few 'select and forget' players like Cleary, Hynes, SJ, Haas - players who are proven performers and cost 700k+
This is important as you want a few players you can rely on for 60+ scores each week. This means you can captain and vc these players. You want to keep these players the whole time unless they get injured, dropped, or a change of role (i.e if Haas started off the bench for a month).
Mid Tier
These guys are anywhere between 3-650k, but the key is you want players who are going to go up in value - so, players who have switched teams and now have a larger role, or maybe they had a shit year last year through injury and poor form, or juniors increasing in game time. Brandon Smith is a good example - poor year last year and should be averaging close to 50 a game, he's only 540k at the moment so if you think he's going to improve on his average last year, pull the trigger. I've picked up Kyle Flanno as he was a part time hooker last year, now playing in the halves. If he averages 40 points a game he'll make you some decent money.
Cash cows
These are the players who are close to basement price (300k or less) who are getting regular game time - for me it has to be 30min plus to be making decent money. Cash cows are generally used to make money, so the challenge for you is to decide when to trade out a cash cow. Plenty of times I've sold a cash cow because I think hes done making money only to then have another few big weeks, which means I've lost out on that money that was made. Very occasionally, you will have a cash cow who turns out so good, he ends up being a gun/keeper and averages over 50, which is quite rare. So, for example in you're team you have Xavier Willison starting. That's not a great choice as he was listed on the bench, and as a newbie he will likely only average 15-25 minutes so less opportunity to score well. He's worth having in your non playing reserves potentially (I had him at one point), but not as a starter. Jaemon Salmon, if he starts and keeps his spot all year would likely be a great option if he gets big minutes.