Is there a way to add Avalara to a basic Shopify plan?

Your Shopify tax solution is almost a year old but I think might be really helpful to me. I’m a senior-senior and a Newbie to Shopify. All this tax stuff is overwhelming for me. I want to try a POD hobby-business, whatever. I just want to try it for now but I can’t even get the pieces together to set it up. The taxes, obviously, are a problem. I can’t do anything expensive at this point. So – you say stick with regular Shopify and then get Shopify Tax? How does Avalara fit in? There is an Avalara rep who’s been emailing me . . . Avalara has a plan that’s free for 3 months and then $19 a month afterward. That seems expensive. What about filing taxes monthly or quarterly. Would I have to do that and how difficult is it to do?

I don’t have a sales tax # – where do I get that? Oh, thank you!

Elaine531