Best practices vary from person to person, there is no practise that works for all. Have your keywords selected properly, the first 7 days should be put as experimental budget the amount that you can burn just to get these new campaigns started, closely monitor the search terms in the initial phase, block off terms that do not add value to your campaigns, do not opt into search and display partners, do not use broad match keywords initially, create your primary conversion actions carefully, carefully convey the message the person looking for your business / service / product, use every possible thing to convey that message, headlines, descriptions, landing pag, sitelinks, callouts, structured snippets, call, location, price, promo if the basic setup of campaigns is in place and you can keep optimising further.
New advertisers are at a huge disadvantage as they cannot use business name, business logo and image assets as they startoff, your competitor who has been in the business will have intial advantage of you are starting off as new. There are N number of ways the optimization can move into, you just have to know what is healthy and what is not, this comes with experiance or burning – learning