From sample to appropriate tool

Question

[emiliomastriani]

Hello guys, My question will sound strange probably, but it is important to me. Suppose making or applying a metagenomic pipeline to identify the taxonomy of the samples you have, in my case it is viral samples (usually). Of course, knowing which technique has been used to collect the data is fundamental to utilizing the appropriate bio-informatics tool. So, let's assume I have my fasta or fastq files, here are my questions:

1. where to get which sequencing technology has been used?
2. which information is relevant to determine to right bioinformatic tools?
3. does exist a "big picture" depicting the most common sequencing techniques and their bioinformatic tools?

I am sorry for my "stupid" question, but to find the right answer looks like "pulling needles in the haystack", so any kind of support will be very welcome.

Thank you.