Need help with a registration app. Does someone have a starter template I can use?

I need to write something for a nonprofit organization.

At its simplest level, it’s just a data collection form that the Internet has had for 20 years.
and I don’t need backend functionality or update and delete.
Just to allow someone to collect some data and submit a payment.

I could explain it like this.
Let’s say it is a sign up for your children to play in a sports league.
You as a parent will come to a site and see several events to register for. With each event you need to enter some details like your sons name and age, plus upload an image.
In your “transaction “you may enter the same kid for more than one event.
Or you may enter multiple events with different kids . But each one Has to have X amount of information fields with it plus that upload of an image. Yes, it’s like an e-commerce site, but certainly without all the bells and whistles that you would have in traditional inventory. It’s only a couple of items to register for. And this is only once a year registration.
At the end it’s a simple payment.

There’s certainly lots of alternatives on the Internet to do this.
RSVPify.com can register events, or appsheet or glide .
But I’d really like to do it in Wappler as my first real app.

So if there are starter templates of some kind that I can use, so I don’t have to reinvent the wheel for payment etc. that sure would be great to get me started.
Does anyone have something they can send me as an app?
Or does something like this exist already in training materials?
Or does someone have something they can offer me for a modest fee?
I’m a lifelong programmer, I just new to Wappler. So I can certainly modify anything that comes my way to tweak it to my needs.
Any ideas would be appreciated.

I have my own windows server and MSSQL database already That I plan to use.
I will use a back end system to do internal maintenance on the registrations etc.

Thanks