Memento: you should only ever use reliable and expertly vetted resources — and that goes for Latin composition too. Below are a few resources to help with your Latin composition.
If you need an extensive dictionary of ancient and medieval Latin, use Logeion.
If you need a basic English-to-(ancient) Latin dictionary, start with Whitaker’s Words. You should check your words in Logeion to make sure you have found a word with the proper sense.
If you require a more substantial English-to-Latin resource, focused mostly although not exclusively on ancient Latin, try “Smith’s English-Latin Dictionary”.
For modern words and concepts, begin with The Morgan-Owens Lexicon of Neo-Latin and Contemporary Latin Usage. The “Adumbratio” is the current dictionary and includes only words that have been attested by Neo-Latin authors; the “Silva” includes even more words, although not all of these have been properly edited or vetted. For your purposes, these are likely still acceptable.
Finally, you may be interested in John Traupman’s Conversational Latin for Oral Proficiency, which is available in the library.