I have database of 200+ future clients.

My work is to call / e-mail them to arrange meetings. Then they move to active client status.

That is the whole project from my side. I don't see clients using my app (whatever it would be).

Can you direct me how to start with that.

1. enter clients data. all contacts i have

2. create tasks (e-mail/call)

from there I can get on bymyself.