There are a few options, and some can be slightly emphasised:
- without help from
- without any help from
- with no help from
- without the help of
Here is the order in which they are commonly preferred (if you click on the image it will be enlarged):
Although NGram finds instances of without the help from, it is very rare and I wouldn't recommend it.
One more NGram shows you what prepositions are the most commonly used with both variants, without the help and without help.
Note: with no help is the strongest negation which would emphasise the exploit of launching the business alone.