You would use "whatever" anyplace you would use the phrase "of any kind" "We don't have any paper whatever." = "We don't have any paper at all/of any kind" You can also use it as "no matter what" "We will succeed whatever happens" = we will succeed no matter what happens. 'However' can be used in place of 'whatever way" or 'in whatever degree' However we proceed will not involve violence." - In whatever way we proceed, it will not involve violence.

whatever = なんでも however = どうでも

Thanks! It's very confusing but I'll try to get used to writing them little by little. I want to write/speak English more naturally than now.

I made a mistake! The second example should be "("That helps me. However, I wonder..." Ignore this if it's confusing, or feel free to ask me to explain better!

Yes, perfect!! Only the punctuation is a little wrong. "Thank you, Julie. That helps me; however, I wonder if I can use it naturally or not" is better. In English, if you use a comma (,) to connect two complete sentences, you also need a coordinating conjunction (for, and, nor, but, or, yet, so). If you tie them together without a coordinating conjunction, we use a semicolon (;). So "however" can come either at the beginning of a new sentence ("That helps me. However; I wonder...") or after a semicolon. And it has a comma after it! I hope that wasn't confusing. It's not a very important detail. Other than that, it was perfect. :-)