SEO advice needed! How much to charge first client?

It looks like I've got a client, who wants me to bring his website to #1 spot on google.
His Domain(PR2) is 10+ years old and he is selling some services and software ( $300-$3000)

I was offering some Profile-backlinks, which I was outsourcing elsewhere.
He got interested in my service, but probably wants me to do seo work until he hits number one spot for two keyphrases. I haven't sold him anything, yet.

Keyword 1: 2 words, results: 49 Mio, allintitle: 80.000, Monthly global searches: 130
he is currently on 3rd position for that keyword.
Position 1 and Position 2 are from same domain(PR3), which have the keyphrase as the domainname and around 50 indexed backlinks.

Keyword 2: 2 words, results: 1 Mio, allintitle: 8.000, Monthly global searches: 480
he is currently on Position 8 for that keyphrase.
1st Position Domain(PR3 8 years old) has around 33.000 indexed backlinks

When I checked the indexed backlinks of my potential client's website I found around 400+ backlinks, which are mostly spammed comments on asian blogs

To be honest, I have very little experience in SEO.
I have been a BHW member for over a year. I know how to use scrapebox, have a small list of high pr blogs, my own list of 1000+ autoapprove blogs. I achieved 2nd spot with a micro niche site (keyoword 5.5k low comp.). I know how to outsource some of the work.

My questions is, how easy is it to bring him to #1 spot?
Do I have enough knowledge for getting him #1?
And how much can I charge?
He is ranking pretty high for having such low quality backlinks.
Is outsourcing the work enough? Getting some xrummer blast from fiverr, social bookmarking from BHW and blasting some comments + few high pr blog comments.

It would be great if someone could help me and maybe give me some advice.

Thanks!

First off, only you know the answer to the question of if you have enough knowledge/experience to get him to #1 or not.

My suggestion would be NOT to take clients until you have taken at least 10 real, quality sites to the top of the search engines and proven that your techniques work in the field.

Testing trial and error without a solid, practical and most importantly, RESULT GAINING and productive arsenal of techniques, on an unsuspecting client is only going to end up with you looking unprofessional, damaging your obvious unknown status/reputation to the field, as well as cause legal and financial issues.

If you don't have the experience in building the income streams and marketing ranks for your own sites, as the very least, you shouldn't be claiming you can do it if/when you never have...1 site isn't doing it.

10+ sites or more is a proven and valid track record that you can stand on.

Harsh but honest...As an experienced marketer, programmer and seo specialist, I would highly recommend building your work history a little more before stepping into this blindly.

Food for thought.

Thats why I had doubts about it. He asked for it and I just thought it looked pretty easy getting him up for these keywords. But I will take your advice and try to make some of my own Websites rank first.
Thanks!