Run Ben Wallace at the PF and either bring Kareem off the bench or put AD at center. Ben Wallace is too short to compete with the majority of centers.
Save up about 15k vc and get Amy VC, if you can save 30k id recommend the amy jimmy butler, and for 15-20k you can get the amy john collins. He has a 95 open three, good badges, good dunking stats, and good rebounding. A must cop.
If you keep running no real life money spent I recommend going to mycareer to grind VC. Use that VC to buy packs that come out. Don't spend them on league moment packs unless there's a star player at diamond or pink diamond. If you get a duplicate card auction it. Check how much it goes for and make it the starting bid. Hold on to the MT until you see that you can buy pink diamonds. A couple series one 20th anniversary cards should be under 100K but that would be limited to Ben Wallace and one or two other players. Repeat until you somehow collect all 6 and get the galaxy opal Chris Paul. Also try and grind tokens and get to the diamond cards. The first one you want is Carmello and get the rest after a crap ton more grinding. Repeat these steps and try to complete sets for special reward cards. Good luck and post updates about your team for more advice and progress reports.