Bootstrap if you want to take the harder path because it requires a lot of work and focus, especially if you are going to be a Customer Centric. You should be able to land new customers monthly and get some profits to pay whoever is working on the project. Otherwise, you'll end up burnt out.
Definitely bootstrap for as long as you can. Even if you end up seeking external funding, you will be in much better position rather than giving up equity at the very start.