What should be the top 5 items needed to start my own Business?

[abc]

Not sure where to start but on a tight budget, what do you think the first priority should be before starting? 
After the company name has been registered and Tax numbers received. 
Any suggestions?

1) Register Company?
2) Business Templates for a care contract
3) Business Cards and Website? (Do I need this?)
4) ?
5) ?

Thanks in advance