Welcome indeed! Nice to see some new faces in this league and less bots is always good.
Firstly, I would say it stronger - do not buy any more players right now! Investing in your arena should be your #1 financial priority for several seasons to come. Make do with what you have now, and given that you're down to just 5 players I'd actually just buy a couple more players so you have a roster to rotate, maybe 3 more to make 8 total. Make sure those 3 you buy don't cost any more than 10,000. Potential doesn't matter, you just want someone with not terrible stats for around 4-5k salary.
If you have any questions feel free to ask, there should be plenty for you to do with getting stuck into the newbie guides and help forums.