1. Hello, my name is Sebastian and I have recently become interested
in Old Norse. Languages are my hobby.

2. How does one sort þ and ð in the alphabet?

3. maðr has an irregular declension, does this make a weak masculine noun?

4. In exercise 3.1 one of "Old Norse for Beginners" the sentences reads:
"Allir vilja bátinn taka því at Óláfr á hann."

Can someone expand more upon the word order for modal auxiliary verbs?
The explanation and examples given in section 1.3 seemed to indicate
subject + modal + verb + object (No other forms are given in the examples)

Thank you very much, it is great to belong to this group!