Thanks very much everyone! I do appreciate all of your feedback. After 15 emails back and forth today th my DM, I've decided to choose a different spell as Earthbind is not capable of doing what I had intended. We just leveled up to 4th level, so now is the time to consider other options.
Does anyone care to mention thier favorite 1st and 2nd level warlock spells? I'd be happy to get your input.
Since it sounds like you were going for a version of it anyway, why not go with hold person?
Otherwise, it really depends what kind of warlock your going for - the class probably has the most customization in 5e as far as range, melee, frontline, support etc. - depending on what options you choose.
I am partial to Armor of Agathys - it's long lasting, non-concentration and the damage ramps up decently (especially since warlock spells auto level up).