The acquisition cost depends on the channel you will use to reach out your clients and your ability to target them.

At first, you will probably spend quite a lot in order to find the right mix for targeting and you will hopefully improve that.

What I would do is to put a small budget and test (a lot) what are the best acquisition channel and targets.

In my case, I had the opportunity to build a platform of 200 000 users just by using the right channel and targeting the right people in 9 months with no users at all at all in the beginning. We have decreased our acquisition cost by more than 50% since the launch.

But if I can add a remark, I was not focused on the cost to acquire a user, but simply to be able to acquire some. The first objective is to understand how a client is interested by your plateform (the value of your freelancers) and how much you would get out of a client and then try to optimize its acquisition process.

I'd happy to share more with you if you want.

Alexandre