What is cross linking in seo?

The cost of SEO depends a great deal on three things: 1) The specific services being offered (SEO, social media, content strategy, etc.) 2) The degree in which those services will be implemented (how many hours per month) 3) the skill and experience level of the SEOs involved. $800/month is a pretty small investment if you consider all the layers to making a web marketing campaign successful. My company will usually not touch any fully-managed web marketing campaign for less than $1500/month and that's at the low end of the aggressiveness meter even for a pretty basic site. A larger ecommerce site might start around $5K and go up from there. Overall, you want to look for value and results. You'll want to know how long the SEO has been in business and when looking at proposals you need to understand the amount of time the company will be investing in the campaign. You also want to spell out your goals and establish the expectations on how/when those goals will be achieved. When the SEO and client don't have the same expectations, that can lead to issues later on. But if you know what the goals are you can both be on the same page from the start.

TL;DR -> Yes you will risk it if you don't perform a proper audit and migration from the original platform. Any type of architecture changes can 100% ruin your SEO if you are not migrating content and topics correctly. Many people assume this is limited to URI structure but underestimate the power of Topical hierarchy and the content, internal linking and URI structure which play a crucial role into any migration effort. If you have any questions about the migration process, give me a shout. Decent free migration checklist: https://searchengineland.com/site-migration-seo-checklist-dont-lose-traffic-286880

Go for Wordpress initially. -- Custom website will delay your launch plans considering all factors. -- Wordpress can be used to meet your requirements from day 1. -- Once you have enough visitors and decided the revenue model + business objective plan for a customized website to be developed from scratch.

Most of my friends use www.wordpress.org and http://member.wishlistproducts.com/ to create their membership sites. Hope that helps.

The best technology is whatever gets you up and running the quickest. You'll throw away the first iteration (and possibly the second and third...) anyway. What you need most in the beginning is to test your idea and get feedback, and you need it fast.