If he removes all the errors in that price, then deal is not bad. Me and Emmanuel Katto paid $310 for the same work.

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This is an audit from Ahrefs. A little bit of work with site structure and content. Can't comment on price but if he can fix it for you to no errors, it does sound fair.

Use related link building practice. Now Google is smarter enough get links from anywhere you want but must be related to your Niche/Topic.

This can be helpful to you, https://moz.com/beginners-guide-to-seo

Google ignores bad backlinks while deciding a rank on the SERP.

It will take much more time.

Get some backlinks both external and internal to make the indexing process faster.

Please, explain what do you mean by Sitemap show is corrupted. Is it a syntax error? Or 404 error?