If you don’t already have a campaign manager, get one. Now.
Don’t spend any money on anything unless and until you have a campaign manager.
If you don’t know where to find a campaign manager, ask someone who has used a campaign manager where they found theirs.
Make sure you think the manager is someone you can work closely with and someone you won’t mind taking direction from.
Once you’ve found and hired your campaign manager, follow their advice. Put your trust in what they tell you about your race and how to win it.