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There isn't one. There never is. There is no such thing as a "best" marketing strategy. Even if there was, you wouldn't know which one it was until all the marketing campaigns were finished and evaluated.
Curiously, for most startups there is a worst marketing strategy, which is traditional paid advertising.
There are dozens if not hundreds marketing techniques. Choose about4 or5 that fit your skills, time and budget and give them a whirl. Measure everything. Keep the best two, bin the others and try new ones.
Always start with the basics - listings in the phone book and other directories. Business cards. Get a very simple5 page website (home, privacy, contact us etc) while you figure our whether you want a proper website and if so, what you want it for. Learn about email autoresponders and collect email addresses. Remember that on average it takes at least7 potential customer contacts before they'll even get in touch with you. (That's why paid advertising doesn't work.) Testimonials and referrals. Local media.
Once you've done all that, plus all the other things you think of that I haven't written, then you can start to consider things like direct mail, cold calling, pay per click and so on.
Having said all that, nothing ever beats word of mouth.
Step-1: Analyze competition and potential (based on existing resources)
Step-2: Evaluate budgets, allocate for offline & online marketing campaigns
Step-3: Operate campaigns and Record & Measure results
Step-4: Repeat Step-1