But, what will you do?, maybe mapping? it is hard to find people to join a project which only have a name and no other information.
Also: what you aer asking for is a full team of developers that have to make a mod (or a total conversion) just for the like of doing it!!. If you can give some work already done sometimes people will spoonfed you a bit as I was before (thanks eternally to Sheppard and Solokiller for spoonfed me with a showel
), but you give very few to others to make them be interested in your project.
What about a storyline?, it could be cool to see how the story will start, what are your goals, what amount of work you have already done, what assets you will need (let´s say you´ll need 4 monsters, 4 new weapons, and so on), what kind of maps you will need (remember that unless you use Xash3D open world maps are not very Goldsource friendly), if you will overpass engine limits (max_edicts crashes will occur), etc, etc.
Once that info is available, people will consider to join a team. In the meantime you SHOULD start to gather some skills in any of the areas of the mod: mapping, 2D editing, sound editing, modelling, etc.
Oh. And AVOID DOING THINGS LIKE THIS!!!https://www.moddb.com/mods/half-life-aliens-vs-predator
You cannot take another game´s assets and then put them into your mod. (Gamebanana is your paradise, man).
It is better to use SKINS and modify them giving ALL credit to the creators and AFTER ALWAYS asking permission from them.
Unless you are doing a private and non distributable mod, of course.