A few constructive criticisms. I am not going to debate the reality of 'lost souls' I personally don't believe in such things, but my criticisms are on the methodology.
For one, this is not an invocation it is an evocation- invocation is when you call in a spirit, evocation is essentially drawing out, or calling up, an entity and contraining it to do your bidding, charge talismans etc.
Usually some medium is required for etheric manifestation of the spirit, for many years people used incense, I believe the cystal ball or black scrying mirror has become the staple equipment used in the occult community.
Your paragraph is written in bad old English.
In it you mention the spirit manifesting within a circle, traditionally a triangle is used for evocation, most people place this outside the circle which the magician stands in. Personally I have recently decided this is not the correct decision.
Again, this has nothing on the key of solomon methodologies, but some people like to keep things simple. Personally, I believe you are missing some vital steps to the traditional evocation procedure. Purification and consecration of the magician, banishings, invocations of divine forces, evocation of spirit and charging with task, and a dismissal- then a banishing afterwards. Again, people like to keep things simple, but in m opinion one should first get to know traditional methods before creating your own.